231998031 has 24 divisors (see below), whose sum is σ = 359115120. Its totient is φ = 143805696.

The previous prime is 231998009. The next prime is 231998051. The reversal of 231998031 is 130899132.

It is not a de Polignac number, because 231998031 - 2¹⁷ = 231866959 is a prime.

It is a super-2 number, since 2×231998031² = 107646172775753922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231998051) 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 23 ways as a sum of consecutive naturals, for example, 3565 + ... + 21833.

It is an arithmetic number, because the mean of its divisors is an integer number (14963130).

Almost surely, 2^231998031 is an apocalyptic number.

231998031 is a deficient number, since it is larger than the sum of its proper divisors (127117089).

231998031 is a wasteful number, since it uses less digits than its factorization.

231998031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18375 (or 18372 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 231998031 is about 15231.4815759991. The cubic root of 231998031 is about 614.4616268013.

The spelling of 231998031 in words is "two hundred thirty-one million, nine hundred ninety-eight thousand, thirty-one".