122791657 has 2 divisors, whose sum is σ = 122791658. Its totient is φ = 122791656.

The previous prime is 122791639. The next prime is 122791681. The reversal of 122791657 is 756197221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120912016 + 1879641 = 10996^2 + 1371^2 .

It is a cyclic number.

It is not a de Polignac number, because 122791657 - 2²³ = 114403049 is a prime.

It is not a weakly prime, because it can be changed into another prime (122791057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61395828 + 61395829.

It is an arithmetic number, because the mean of its divisors is an integer number (61395829).

Almost surely, 2^122791657 is an apocalyptic number.

It is an amenable number.

122791657 is a deficient number, since it is larger than the sum of its proper divisors (1).

122791657 is an equidigital number, since it uses as much as digits as its factorization.

122791657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52920, while the sum is 40.

The square root of 122791657 is about 11081.1396977026. The cubic root of 122791657 is about 497.0380307917.

The spelling of 122791657 in words is "one hundred twenty-two million, seven hundred ninety-one thousand, six hundred fifty-seven".