231520023 has 12 divisors (see below), whose sum is σ = 382191888. Its totient is φ = 132297120.

The previous prime is 231519973. The next prime is 231520027. The reversal of 231520023 is 320025132.

It is not a de Polignac number, because 231520023 - 2¹⁸ = 231257879 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231519978 and 231520005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231520027) 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 11 ways as a sum of consecutive naturals, for example, 1837398 + ... + 1837523.

It is an arithmetic number, because the mean of its divisors is an integer number (31849324).

Almost surely, 2^231520023 is an apocalyptic number.

231520023 is a deficient number, since it is larger than the sum of its proper divisors (150671865).

231520023 is a wasteful number, since it uses less digits than its factorization.

231520023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3674934 (or 3674931 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 231520023 is about 15215.7820370824. The cubic root of 231520023 is about 614.0393250427.

Adding to 231520023 its reverse (320025132), we get a palindrome (551545155).

The spelling of 231520023 in words is "two hundred thirty-one million, five hundred twenty thousand, twenty-three".