231940989 has 40 divisors (see below), whose sum is σ = 399218688. Its totient is φ = 131453280.

The previous prime is 231940957. The next prime is 231941023. The reversal of 231940989 is 989049132.

231940989 is a `hidden beast` number, since 231 + 9 + 409 + 8 + 9 = 666.

It is not a de Polignac number, because 231940989 - 2⁵ = 231940957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231940909) 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 39 ways as a sum of consecutive naturals, for example, 70399 + ... + 73619.

Almost surely, 2^231940989 is an apocalyptic number.

It is an amenable number.

231940989 is a deficient number, since it is larger than the sum of its proper divisors (167277699).

231940989 is a wasteful number, since it uses less digits than its factorization.

231940989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3367 (or 3358 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 231940989 is about 15229.6089575537. The cubic root of 231940989 is about 614.4112628779.

The spelling of 231940989 in words is "two hundred thirty-one million, nine hundred forty thousand, nine hundred eighty-nine".