157572409 has 4 divisors (see below), whose sum is σ = 159924304. Its totient is φ = 155220516.

The previous prime is 157572407. The next prime is 157572431. The reversal of 157572409 is 904275751.

157572409 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 not a de Polignac number, because 157572409 - 2¹ = 157572407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157572407) 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, 1175847 + ... + 1175980.

It is an arithmetic number, because the mean of its divisors is an integer number (39981076).

Almost surely, 2^157572409 is an apocalyptic number.

It is an amenable number.

157572409 is a deficient number, since it is larger than the sum of its proper divisors (2351895).

157572409 is an equidigital number, since it uses as much as digits as its factorization.

157572409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2351894.

The product of its (nonzero) digits is 88200, while the sum is 40.

The square root of 157572409 is about 12552.7849101305. The cubic root of 157572409 is about 540.1238958971.

It can be divided in two parts, 1575 and 72409, that added together give a square (73984 = 272²).

The spelling of 157572409 in words is "one hundred fifty-seven million, five hundred seventy-two thousand, four hundred nine".