157122691 has 4 divisors (see below), whose sum is σ = 171406584. Its totient is φ = 142838800.

The previous prime is 157122671. The next prime is 157122727. The reversal of 157122691 is 196221751.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 157122691 - 2¹¹ = 157120643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157122671) 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 in 3 ways as a sum of consecutive naturals, for example, 7141930 + ... + 7141951.

It is an arithmetic number, because the mean of its divisors is an integer number (42851646).

Almost surely, 2^157122691 is an apocalyptic number.

157122691 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

157122691 is a deficient number, since it is larger than the sum of its proper divisors (14283893).

157122691 is a wasteful number, since it uses less digits than its factorization.

157122691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14283892.

The product of its digits is 7560, while the sum is 34.

The square root of 157122691 is about 12534.8590339102. The cubic root of 157122691 is about 539.6095611599.

The spelling of 157122691 in words is "one hundred fifty-seven million, one hundred twenty-two thousand, six hundred ninety-one".