122157881 has 2 divisors, whose sum is σ = 122157882. Its totient is φ = 122157880.

The previous prime is 122157863. The next prime is 122157911. The reversal of 122157881 is 188751221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86862400 + 35295481 = 9320^2 + 5941^2 .

It is a cyclic number.

It is not a de Polignac number, because 122157881 - 2¹⁴ = 122141497 is a prime.

It is a super-2 number, since 2×122157881² = 29845095780820322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (122157811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61078940 + 61078941.

It is an arithmetic number, because the mean of its divisors is an integer number (61078941).

Almost surely, 2^122157881 is an apocalyptic number.

It is an amenable number.

122157881 is a deficient number, since it is larger than the sum of its proper divisors (1).

122157881 is an equidigital number, since it uses as much as digits as its factorization.

122157881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8960, while the sum is 35.

The square root of 122157881 is about 11052.5056435181. The cubic root of 122157881 is about 496.1814191213.

The spelling of 122157881 in words is "one hundred twenty-two million, one hundred fifty-seven thousand, eight hundred eighty-one".