231102640 has 40 divisors (see below), whose sum is σ = 549817488. Its totient is φ = 90289920.

The previous prime is 231102637. The next prime is 231102647. The reversal of 231102640 is 46201132.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (231102647) 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 7 ways as a sum of consecutive naturals, for example, 30151 + ... + 37030.

Almost surely, 2^231102640 is an apocalyptic number.

231102640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231102640 is an abundant number, since it is smaller than the sum of its proper divisors (318714848).

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

231102640 is a wasteful number, since it uses less digits than its factorization.

231102640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67237 (or 67231 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 231102640 is about 15202.0603866713. The cubic root of 231102640 is about 613.6701075279.

Adding to 231102640 its reverse (46201132), we get a palindrome (277303772).

The spelling of 231102640 in words is "two hundred thirty-one million, one hundred two thousand, six hundred forty".