122939791 has 4 divisors (see below), whose sum is σ = 132396712. Its totient is φ = 113482872.

The previous prime is 122939759. The next prime is 122939809. The reversal of 122939791 is 197939221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 197939221 = 191 ⋅1036331.

It is a cyclic number.

It is not a de Polignac number, because 122939791 - 2⁵ = 122939759 is a prime.

It is a super-2 number, since 2×122939791² = 30228384422247362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122939711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4728441 + ... + 4728466.

It is an arithmetic number, because the mean of its divisors is an integer number (33099178).

Almost surely, 2^122939791 is an apocalyptic number.

122939791 is a deficient number, since it is larger than the sum of its proper divisors (9456921).

122939791 is an equidigital number, since it uses as much as digits as its factorization.

122939791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9456920.

The product of its digits is 61236, while the sum is 43.

The square root of 122939791 is about 11087.8217427951. The cubic root of 122939791 is about 497.2378235281.

The spelling of 122939791 in words is "one hundred twenty-two million, nine hundred thirty-nine thousand, seven hundred ninety-one".