157572561 has 4 divisors (see below), whose sum is σ = 210096752. Its totient is φ = 105048372.

The previous prime is 157572557. The next prime is 157572629. The reversal of 157572561 is 165275751.

157572561 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 not a de Polignac number, because 157572561 - 2² = 157572557 is a prime.

It is a super-2 number, since 2×157572561² = 49658223960197442, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (157574561) 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, 26262091 + ... + 26262096.

It is an arithmetic number, because the mean of its divisors is an integer number (52524188).

Almost surely, 2^157572561 is an apocalyptic number.

It is an amenable number.

157572561 is a deficient number, since it is larger than the sum of its proper divisors (52524191).

157572561 is an equidigital number, since it uses as much as digits as its factorization.

157572561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52524190.

The product of its digits is 73500, while the sum is 39.

The square root of 157572561 is about 12552.7909645624. The cubic root of 157572561 is about 540.1240695713.

The spelling of 157572561 in words is "one hundred fifty-seven million, five hundred seventy-two thousand, five hundred sixty-one".