31020001223 has 4 divisors (see below), whose sum is σ = 31035725448. Its totient is φ = 31004277000.

The previous prime is 31020001189. The next prime is 31020001237. The reversal of 31020001223 is 32210002013.

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 31020001223 - 2⁸ = 31020000967 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31020001198 and 31020001207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31020001253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7859153 + ... + 7863098.

It is an arithmetic number, because the mean of its divisors is an integer number (7758931362).

Almost surely, 2^31020001223 is an apocalyptic number.

31020001223 is a deficient number, since it is larger than the sum of its proper divisors (15724225).

31020001223 is a wasteful number, since it uses less digits than its factorization.

31020001223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15724224.

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

Adding to 31020001223 its reverse (32210002013), we get a palindrome (63230003236).

The spelling of 31020001223 in words is "thirty-one billion, twenty million, one thousand, two hundred twenty-three".