231012981 has 12 divisors (see below), whose sum is σ = 334248460. Its totient is φ = 153748800.

The previous prime is 231012979. The next prime is 231013009. The reversal of 231012981 is 189210132.

It can be written as a sum of positive squares in 2 ways, for example, as 126360081 + 104652900 = 11241^2 + 10230^2 .

It is not a de Polignac number, because 231012981 - 2¹ = 231012979 is a prime.

It is a super-2 number, since 2×231012981² = 106733994781012722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231011981) 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 11 ways as a sum of consecutive naturals, for example, 15946 + ... + 26763.

Almost surely, 2^231012981 is an apocalyptic number.

It is an amenable number.

231012981 is a deficient number, since it is larger than the sum of its proper divisors (103235479).

231012981 is a wasteful number, since it uses less digits than its factorization.

231012981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43316 (or 43313 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 231012981 is about 15199.1111911190. Note that the first 4 decimals coincide. The cubic root of 231012981 is about 613.5907370729.

The spelling of 231012981 in words is "two hundred thirty-one million, twelve thousand, nine hundred eighty-one".