157017791 has 4 divisors (see below), whose sum is σ = 179448912. Its totient is φ = 134586672.

The previous prime is 157017787. The next prime is 157017841. The reversal of 157017791 is 197710751.

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 157017791 - 2² = 157017787 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157037791) 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 3 ways as a sum of consecutive naturals, for example, 11215550 + ... + 11215563.

It is an arithmetic number, because the mean of its divisors is an integer number (44862228).

Almost surely, 2^157017791 is an apocalyptic number.

157017791 is a deficient number, since it is larger than the sum of its proper divisors (22431121).

157017791 is an equidigital number, since it uses as much as digits as its factorization.

157017791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22431120.

The product of its (nonzero) digits is 15435, while the sum is 38.

The square root of 157017791 is about 12530.6740042186. The cubic root of 157017791 is about 539.4894477115.

The spelling of 157017791 in words is "one hundred fifty-seven million, seventeen thousand, seven hundred ninety-one".