230157981 has 12 divisors (see below), whose sum is σ = 343175040. Its totient is φ = 148488840.

The previous prime is 230157979. The next prime is 230158009. The reversal of 230157981 is 189751032.

230157981 is a `hidden beast` number, since 2 + 3 + 0 + 1 + 579 + 81 = 666.

It is not a de Polignac number, because 230157981 - 2¹ = 230157979 is a prime.

It is a super-2 number, since 2×230157981² = 105945392435992722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (230157901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 412191 + ... + 412748.

It is an arithmetic number, because the mean of its divisors is an integer number (28597920).

Almost surely, 2^230157981 is an apocalyptic number.

It is an amenable number.

230157981 is a deficient number, since it is larger than the sum of its proper divisors (113017059).

230157981 is a wasteful number, since it uses less digits than its factorization.

230157981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 824976 (or 824973 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 230157981 is about 15170.9584733464. The cubic root of 230157981 is about 612.8328162638.

The spelling of 230157981 in words is "two hundred thirty million, one hundred fifty-seven thousand, nine hundred eighty-one".