156150721 has 4 divisors (see below), whose sum is σ = 164369200. Its totient is φ = 147932244.

The previous prime is 156150707. The next prime is 156150733. The reversal of 156150721 is 127051651.

156150721 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 156150721 - 2⁹ = 156150209 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 156150721.

It is not an unprimeable number, because it can be changed into a prime (156120721) 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, 4109211 + ... + 4109248.

It is an arithmetic number, because the mean of its divisors is an integer number (41092300).

Almost surely, 2^156150721 is an apocalyptic number.

It is an amenable number.

156150721 is a deficient number, since it is larger than the sum of its proper divisors (8218479).

156150721 is an equidigital number, since it uses as much as digits as its factorization.

156150721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8218478.

The product of its (nonzero) digits is 2100, while the sum is 28.

The square root of 156150721 is about 12496.0282089950. The cubic root of 156150721 is about 538.4945736074.

The spelling of 156150721 in words is "one hundred fifty-six million, one hundred fifty thousand, seven hundred twenty-one".