213656657 has 2 divisors, whose sum is σ = 213656658. Its totient is φ = 213656656.

The previous prime is 213656633. The next prime is 213656669. The reversal of 213656657 is 756656312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192210496 + 21446161 = 13864^2 + 4631^2 .

It is a cyclic number.

It is not a de Polignac number, because 213656657 - 2⁶ = 213656593 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (213656257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106828328 + 106828329.

It is an arithmetic number, because the mean of its divisors is an integer number (106828329).

Almost surely, 2^213656657 is an apocalyptic number.

It is an amenable number.

213656657 is a deficient number, since it is larger than the sum of its proper divisors (1).

213656657 is an equidigital number, since it uses as much as digits as its factorization.

213656657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 226800, while the sum is 41.

The square root of 213656657 is about 14616.9989053841. The cubic root of 213656657 is about 597.8223438812.

The spelling of 213656657 in words is "two hundred thirteen million, six hundred fifty-six thousand, six hundred fifty-seven".