656934121 has 2 divisors, whose sum is σ = 656934122. Its totient is φ = 656934120.

The previous prime is 656934067. The next prime is 656934133. The reversal of 656934121 is 121439656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 362331225 + 294602896 = 19035^2 + 17164^2 .

It is a cyclic number.

It is not a de Polignac number, because 656934121 - 2⁹ = 656933609 is a prime.

It is not a weakly prime, because it can be changed into another prime (656934151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328467060 + 328467061.

It is an arithmetic number, because the mean of its divisors is an integer number (328467061).

Almost surely, 2^656934121 is an apocalyptic number.

It is an amenable number.

656934121 is a deficient number, since it is larger than the sum of its proper divisors (1).

656934121 is an equidigital number, since it uses as much as digits as its factorization.

656934121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 37.

The square root of 656934121 is about 25630.7261114468. The cubic root of 656934121 is about 869.3085275027.

The spelling of 656934121 in words is "six hundred fifty-six million, nine hundred thirty-four thousand, one hundred twenty-one".