156885221 has 8 divisors (see below), whose sum is σ = 159314688. Its totient is φ = 154462000.

The previous prime is 156885173. The next prime is 156885227. The reversal of 156885221 is 122588651.

156885221 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 a cyclic number.

It is not a de Polignac number, because 156885221 - 2²² = 152690917 is a prime.

It is a super-2 number, since 2×156885221² = 49225945136437682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156885227) 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, 82916 + ... + 84786.

It is an arithmetic number, because the mean of its divisors is an integer number (19914336).

Almost surely, 2^156885221 is an apocalyptic number.

It is an amenable number.

156885221 is a deficient number, since it is larger than the sum of its proper divisors (2429467).

156885221 is a wasteful number, since it uses less digits than its factorization.

156885221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3123.

The product of its digits is 38400, while the sum is 38.

The square root of 156885221 is about 12525.3830679944. The cubic root of 156885221 is about 539.3375747863.

The spelling of 156885221 in words is "one hundred fifty-six million, eight hundred eighty-five thousand, two hundred twenty-one".