156213081 has 12 divisors (see below), whose sum is σ = 226522452. Its totient is φ = 103735296.

The previous prime is 156213059. The next prime is 156213091. The reversal of 156213081 is 180312651.

156213081 is a `hidden beast` number, since 1 + 5 + 621 + 30 + 8 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 86657481 + 69555600 = 9309^2 + 8340^2 .

It is not a de Polignac number, because 156213081 - 2⁵ = 156213049 is a prime.

It is a super-2 number, since 2×156213081² = 48805053351025122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (156213091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31456 + ... + 36081.

It is an arithmetic number, because the mean of its divisors is an integer number (18876871).

Almost surely, 2^156213081 is an apocalyptic number.

It is an amenable number.

156213081 is a deficient number, since it is larger than the sum of its proper divisors (70309371).

156213081 is a wasteful number, since it uses less digits than its factorization.

156213081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67800 (or 67797 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 156213081 is about 12498.5231527569. The cubic root of 156213081 is about 538.5662480601.

The spelling of 156213081 in words is "one hundred fifty-six million, two hundred thirteen thousand, eighty-one".