122921861 has 2 divisors, whose sum is σ = 122921862. Its totient is φ = 122921860.

The previous prime is 122921857. The next prime is 122921947. The reversal of 122921861 is 168129221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82992100 + 39929761 = 9110^2 + 6319^2 .

It is a cyclic number.

It is not a de Polignac number, because 122921861 - 2² = 122921857 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122921831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61460930 + 61460931.

It is an arithmetic number, because the mean of its divisors is an integer number (61460931).

Almost surely, 2^122921861 is an apocalyptic number.

It is an amenable number.

122921861 is a deficient number, since it is larger than the sum of its proper divisors (1).

122921861 is an equidigital number, since it uses as much as digits as its factorization.

122921861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 32.

The square root of 122921861 is about 11087.0131685680. The cubic root of 122921861 is about 497.2136493434.

The spelling of 122921861 in words is "one hundred twenty-two million, nine hundred twenty-one thousand, eight hundred sixty-one".