122642513891 has 8 divisors (see below), whose sum is σ = 130140938160. Its totient is φ = 115175662848.

The previous prime is 122642513881. The next prime is 122642513893. The reversal of 122642513891 is 198315246221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122642513891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (122642513893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7885301 + ... + 7900838.

It is an arithmetic number, because the mean of its divisors is an integer number (16267617270).

Almost surely, 2^122642513891 is an apocalyptic number.

122642513891 is a deficient number, since it is larger than the sum of its proper divisors (7498424269).

122642513891 is a wasteful number, since it uses less digits than its factorization.

122642513891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15786613.

The product of its digits is 207360, while the sum is 44.

The spelling of 122642513891 in words is "one hundred twenty-two billion, six hundred forty-two million, five hundred thirteen thousand, eight hundred ninety-one".