156136561 has 8 divisors (see below), whose sum is σ = 180886784. Its totient is φ = 131997600.

The previous prime is 156136531. The next prime is 156136577. The reversal of 156136561 is 165631651.

156136561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 156136561 - 2⁹ = 156136049 is a prime.

It is a super-4 number, since 4×156136561⁴ (a number of 34 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (156136501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152265 + ... + 153286.

It is an arithmetic number, because the mean of its divisors is an integer number (22610848).

Almost surely, 2^156136561 is an apocalyptic number.

It is an amenable number.

156136561 is a deficient number, since it is larger than the sum of its proper divisors (24750223).

156136561 is an equidigital number, since it uses as much as digits as its factorization.

156136561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305631.

The product of its digits is 16200, while the sum is 34.

The square root of 156136561 is about 12495.4616161229. The cubic root of 156136561 is about 538.4782959290.

The spelling of 156136561 in words is "one hundred fifty-six million, one hundred thirty-six thousand, five hundred sixty-one".