230901643981 has 2 divisors, whose sum is σ = 230901643982. Its totient is φ = 230901643980.

The previous prime is 230901643979. The next prime is 230901644003. The reversal of 230901643981 is 189346109032.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 230888899081 + 12744900 = 480509^2 + 3570^2 .

It is a cyclic number.

It is not a de Polignac number, because 230901643981 - 2¹ = 230901643979 is a prime.

It is a super-2 number, since 2×230901643981² (a number of 24 digits) contains 22 as substring.

Together with 230901643979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (230901643781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115450821990 + 115450821991.

It is an arithmetic number, because the mean of its divisors is an integer number (115450821991).

Almost surely, 2^230901643981 is an apocalyptic number.

It is an amenable number.

230901643981 is a deficient number, since it is larger than the sum of its proper divisors (1).

230901643981 is an equidigital number, since it uses as much as digits as its factorization.

230901643981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 46.

The spelling of 230901643981 in words is "two hundred thirty billion, nine hundred one million, six hundred forty-three thousand, nine hundred eighty-one".