231990102 has 32 divisors (see below), whose sum is σ = 516324960. Its totient is φ = 77211360.

The previous prime is 231990071. The next prime is 231990103. The reversal of 231990102 is 201099132.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231990103) 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 15 ways as a sum of consecutive naturals, for example, 36652 + ... + 42512.

It is an arithmetic number, because the mean of its divisors is an integer number (16135155).

Almost surely, 2^231990102 is an apocalyptic number.

231990102 is an abundant number, since it is smaller than the sum of its proper divisors (284334858).

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

231990102 is a wasteful number, since it uses less digits than its factorization.

231990102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6605 (or 6599 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 231990102 is about 15231.2212904941. The cubic root of 231990102 is about 614.4546265669.

The spelling of 231990102 in words is "two hundred thirty-one million, nine hundred ninety thousand, one hundred two".