157243591 has 4 divisors (see below), whose sum is σ = 166493232. Its totient is φ = 147993952.

The previous prime is 157243589. The next prime is 157243607. The reversal of 157243591 is 195342751.

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 157243591 - 2¹ = 157243589 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 157243591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157243091) 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, 4624795 + ... + 4624828.

It is an arithmetic number, because the mean of its divisors is an integer number (41623308).

Almost surely, 2^157243591 is an apocalyptic number.

157243591 is a deficient number, since it is larger than the sum of its proper divisors (9249641).

157243591 is an equidigital number, since it uses as much as digits as its factorization.

157243591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9249640.

The product of its digits is 37800, while the sum is 37.

The square root of 157243591 is about 12539.6806578158. The cubic root of 157243591 is about 539.7479287624.

The spelling of 157243591 in words is "one hundred fifty-seven million, two hundred forty-three thousand, five hundred ninety-one".