230978981 has 2 divisors, whose sum is σ = 230978982. Its totient is φ = 230978980.

The previous prime is 230978977. The next prime is 230979031. The reversal of 230978981 is 189879032.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213422881 + 17556100 = 14609^2 + 4190^2 .

It is a cyclic number.

It is not a de Polignac number, because 230978981 - 2² = 230978977 is a prime.

It is a super-2 number, since 2×230978981² = 106702579327596722, 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 (230978911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115489490 + 115489491.

It is an arithmetic number, because the mean of its divisors is an integer number (115489491).

Almost surely, 2^230978981 is an apocalyptic number.

It is an amenable number.

230978981 is a deficient number, since it is larger than the sum of its proper divisors (1).

230978981 is an equidigital number, since it uses as much as digits as its factorization.

230978981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 47.

The square root of 230978981 is about 15197.9926635066. The cubic root of 230978981 is about 613.5606332688.

The spelling of 230978981 in words is "two hundred thirty million, nine hundred seventy-eight thousand, nine hundred eighty-one".