122157291 has 8 divisors (see below), whose sum is σ = 172457424. Its totient is φ = 76647680.

The previous prime is 122157271. The next prime is 122157311. The reversal of 122157291 is 192751221.

It is an interprime number because it is at equal distance from previous prime (122157271) and next prime (122157311).

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

It is a cyclic number.

It is not a de Polignac number, because 122157291 - 2²² = 117962987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (122157271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1197570 + ... + 1197671.

It is an arithmetic number, because the mean of its divisors is an integer number (21557178).

Almost surely, 2^122157291 is an apocalyptic number.

122157291 is a deficient number, since it is larger than the sum of its proper divisors (50300133).

122157291 is a wasteful number, since it uses less digits than its factorization.

122157291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2395261.

The product of its digits is 2520, while the sum is 30.

The square root of 122157291 is about 11052.4789527056. The cubic root of 122157291 is about 496.1806202985.

The spelling of 122157291 in words is "one hundred twenty-two million, one hundred fifty-seven thousand, two hundred ninety-one".