231540102 has 24 divisors (see below), whose sum is σ = 531180936. Its totient is φ = 72639936.

The previous prime is 231540091. The next prime is 231540107. The reversal of 231540102 is 201045132.

231540102 is a `hidden beast` number, since 23 + 1 + 540 + 102 = 666.

It is a super-2 number, since 2×231540102² = 107221637668340808, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231540107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 378028 + ... + 378639.

It is an arithmetic number, because the mean of its divisors is an integer number (22132539).

Almost surely, 2^231540102 is an apocalyptic number.

231540102 is an abundant number, since it is smaller than the sum of its proper divisors (299640834).

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

231540102 is a wasteful number, since it uses less digits than its factorization.

231540102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756692 (or 756689 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 231540102 is about 15216.4418311246. The cubic root of 231540102 is about 614.0570757596.

Adding to 231540102 its reverse (201045132), we get a palindrome (432585234).

The spelling of 231540102 in words is "two hundred thirty-one million, five hundred forty thousand, one hundred two".