231214981 has 2 divisors, whose sum is σ = 231214982. Its totient is φ = 231214980.

The previous prime is 231214967. The next prime is 231214993. The reversal of 231214981 is 189412132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 202806081 + 28408900 = 14241^2 + 5330^2 .

It is a cyclic number.

It is not a de Polignac number, because 231214981 - 2⁷ = 231214853 is a prime.

It is a super-2 number, since 2×231214981² = 106920734877660722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231214931) 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 as a sum of consecutive naturals, namely, 115607490 + 115607491.

It is an arithmetic number, because the mean of its divisors is an integer number (115607491).

Almost surely, 2^231214981 is an apocalyptic number.

It is an amenable number.

231214981 is a deficient number, since it is larger than the sum of its proper divisors (1).

231214981 is an equidigital number, since it uses as much as digits as its factorization.

231214981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 31.

The square root of 231214981 is about 15205.7548645242. The cubic root of 231214981 is about 613.7695282092.

The spelling of 231214981 in words is "two hundred thirty-one million, two hundred fourteen thousand, nine hundred eighty-one".