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23212031 = 47493873
BaseRepresentation
bin101100010001…
…0111111111111
31121200021220212
41120202333333
521420241111
62145303035
7401204363
oct130427777
947607825
1023212031
11121145a7
127934a7b
134a6943b
1431232a3
15208798b
hex1622fff

23212031 has 4 divisors (see below), whose sum is σ = 23705952. Its totient is φ = 22718112.

The previous prime is 23212009. The next prime is 23212051. The reversal of 23212031 is 13021232.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23212031 - 214 = 23195647 is a prime.

It is a super-2 number, since 2×232120312 = 1077596766289922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23211997 and 23212015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23212051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 246890 + ... + 246983.

It is an arithmetic number, because the mean of its divisors is an integer number (5926488).

Almost surely, 223212031 is an apocalyptic number.

23212031 is a deficient number, since it is larger than the sum of its proper divisors (493921).

23212031 is an equidigital number, since it uses as much as digits as its factorization.

23212031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493920.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 23212031 is about 4817.8865698561. The cubic root of 23212031 is about 285.2579218430.

Adding to 23212031 its reverse (13021232), we get a palindrome (36233263).

The spelling of 23212031 in words is "twenty-three million, two hundred twelve thousand, thirty-one".

Divisors: 1 47 493873 23212031