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30231023 = 181116693
BaseRepresentation
bin111001101010…
…0100111101111
32002212220011112
41303110213233
530214343043
62555542235
7514650044
oct163244757
962786145
1030231023
1116079019
12a15a97b
1363561a4
14402d1cb
1529c2518
hex1cd49ef

30231023 has 4 divisors (see below), whose sum is σ = 30249528. Its totient is φ = 30212520.

The previous prime is 30231013. The next prime is 30231053. The reversal of 30231023 is 32013203.

Adding to 30231023 its reverse (32013203), we get a palindrome (62244226).

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32013203 = 67477809.

It is a cyclic number.

It is not a de Polignac number, because 30231023 - 212 = 30226927 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30230989 and 30231007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30231013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6536 + ... + 10157.

It is an arithmetic number, because the mean of its divisors is an integer number (7562382).

Almost surely, 230231023 is an apocalyptic number.

30231023 is a deficient number, since it is larger than the sum of its proper divisors (18505).

30231023 is a wasteful number, since it uses less digits than its factorization.

30231023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18504.

The product of its (nonzero) digits is 108, while the sum is 14.

The square root of 30231023 is about 5498.2745475285. The cubic root of 30231023 is about 311.5188143433.

The spelling of 30231023 in words is "thirty million, two hundred thirty-one thousand, twenty-three".

Divisors: 1 1811 16693 30231023