157191913 has 8 divisors (see below), whose sum is σ = 164151936. Its totient is φ = 150242400.

The previous prime is 157191901. The next prime is 157191943. The reversal of 157191913 is 319191751.

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 157191913 - 2¹³ = 157183721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157191943) 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, 56628 + ... + 59338.

It is an arithmetic number, because the mean of its divisors is an integer number (20518992).

Almost surely, 2^157191913 is an apocalyptic number.

It is an amenable number.

157191913 is a deficient number, since it is larger than the sum of its proper divisors (6960023).

157191913 is a wasteful number, since it uses less digits than its factorization.

157191913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5255.

The product of its digits is 8505, while the sum is 37.

The square root of 157191913 is about 12537.6199096958. The cubic root of 157191913 is about 539.6887930195.

The spelling of 157191913 in words is "one hundred fifty-seven million, one hundred ninety-one thousand, nine hundred thirteen".