157807091 has 4 divisors (see below), whose sum is σ = 169946112. Its totient is φ = 145668072.

The previous prime is 157807079. The next prime is 157807157. The reversal of 157807091 is 190708751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190708751 = 47 ⋅4057633.

It is a cyclic number.

It is not a de Polignac number, because 157807091 - 2¹⁰ = 157806067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157807031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6069491 + ... + 6069516.

It is an arithmetic number, because the mean of its divisors is an integer number (42486528).

Almost surely, 2^157807091 is an apocalyptic number.

157807091 is a deficient number, since it is larger than the sum of its proper divisors (12139021).

157807091 is a wasteful number, since it uses less digits than its factorization.

157807091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12139020.

The product of its (nonzero) digits is 17640, while the sum is 38.

The square root of 157807091 is about 12562.1292383099. The cubic root of 157807091 is about 540.3919091444.

The spelling of 157807091 in words is "one hundred fifty-seven million, eight hundred seven thousand, ninety-one".