230131981 has 2 divisors, whose sum is σ = 230131982. Its totient is φ = 230131980.

The previous prime is 230131969. The next prime is 230132093. The reversal of 230131981 is 189131032.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208658025 + 21473956 = 14445^2 + 4634^2 .

It is a cyclic number.

It is not a de Polignac number, because 230131981 - 2⁵ = 230131949 is a prime.

It is a super-2 number, since 2×230131981² = 105921457357968722, 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 (230131931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115065990 + 115065991.

It is an arithmetic number, because the mean of its divisors is an integer number (115065991).

Almost surely, 2^230131981 is an apocalyptic number.

It is an amenable number.

230131981 is a deficient number, since it is larger than the sum of its proper divisors (1).

230131981 is an equidigital number, since it uses as much as digits as its factorization.

230131981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 230131981 is about 15170.1015487702. The cubic root of 230131981 is about 612.8097389943.

The spelling of 230131981 in words is "two hundred thirty million, one hundred thirty-one thousand, nine hundred eighty-one".