122971139 has 2 divisors, whose sum is σ = 122971140. Its totient is φ = 122971138.

The previous prime is 122971117. The next prime is 122971151. The reversal of 122971139 is 931179221.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122971139 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 122971099 and 122971108.

It is not a weakly prime, because it can be changed into another prime (122971169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61485569 + 61485570.

It is an arithmetic number, because the mean of its divisors is an integer number (61485570).

Almost surely, 2^122971139 is an apocalyptic number.

122971139 is a deficient number, since it is larger than the sum of its proper divisors (1).

122971139 is an equidigital number, since it uses as much as digits as its factorization.

122971139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6804, while the sum is 35.

The square root of 122971139 is about 11089.2352757077. The cubic root of 122971139 is about 497.2800829314.

The spelling of 122971139 in words is "one hundred twenty-two million, nine hundred seventy-one thousand, one hundred thirty-nine".