230621581 has 2 divisors, whose sum is σ = 230621582. Its totient is φ = 230621580.

The previous prime is 230621579. The next prime is 230621627. The reversal of 230621581 is 185126032.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186186025 + 44435556 = 13645^2 + 6666^2 .

It is a cyclic number.

It is not a de Polignac number, because 230621581 - 2¹ = 230621579 is a prime.

It is a super-2 number, since 2×230621581² = 106372627245879122, which contains 22 as substring.

Together with 230621579, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (230621551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115310790 + 115310791.

It is an arithmetic number, because the mean of its divisors is an integer number (115310791).

Almost surely, 2^230621581 is an apocalyptic number.

It is an amenable number.

230621581 is a deficient number, since it is larger than the sum of its proper divisors (1).

230621581 is an equidigital number, since it uses as much as digits as its factorization.

230621581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 230621581 is about 15186.2299798205. The cubic root of 230621581 is about 613.2440102736.

The spelling of 230621581 in words is "two hundred thirty million, six hundred twenty-one thousand, five hundred eighty-one".