231120015 has 96 divisors (see below), whose sum is σ = 465393600. Its totient is φ = 97284096.

The previous prime is 231120013. The next prime is 231120023. The reversal of 231120015 is 510021132.

It is not a de Polignac number, because 231120015 - 2¹ = 231120013 is a prime.

It is a super-2 number, since 2×231120015² = 106832922667200450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a junction number, because it is equal to n+sod(n) for n = 231119976 and 231120003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231120013) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 662061 + ... + 662409.

It is an arithmetic number, because the mean of its divisors is an integer number (4847850).

Almost surely, 2^231120015 is an apocalyptic number.

231120015 is an abundant number, since it is smaller than the sum of its proper divisors (234273585).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231120015 is a wasteful number, since it uses less digits than its factorization.

231120015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441 (or 434 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 231120015 is about 15202.6318445196. The cubic root of 231120015 is about 613.6854863381.

Adding to 231120015 its reverse (510021132), we get a palindrome (741141147).

The spelling of 231120015 in words is "two hundred thirty-one million, one hundred twenty thousand, fifteen".