157192561 has 4 divisors (see below), whose sum is σ = 157402624. Its totient is φ = 156982500.

The previous prime is 157192549. The next prime is 157192597. The reversal of 157192561 is 165291751.

157192561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157192561 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 157192561.

It is not an unprimeable number, because it can be changed into a prime (157192361) 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, 103905 + ... + 105406.

It is an arithmetic number, because the mean of its divisors is an integer number (39350656).

Almost surely, 2^157192561 is an apocalyptic number.

It is an amenable number.

157192561 is a deficient number, since it is larger than the sum of its proper divisors (210063).

157192561 is an equidigital number, since it uses as much as digits as its factorization.

157192561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210062.

The product of its digits is 18900, while the sum is 37.

The square root of 157192561 is about 12537.6457518946. The cubic root of 157192561 is about 539.6895346138.

The spelling of 157192561 in words is "one hundred fifty-seven million, one hundred ninety-two thousand, five hundred sixty-one".