156505401 has 24 divisors (see below), whose sum is σ = 244540296. Its totient is φ = 95880960.

The previous prime is 156505387. The next prime is 156505403. The reversal of 156505401 is 104505651.

It is a happy number.

156505401 is a `hidden beast` number, since 1 + 5 + 650 + 5 + 4 + 0 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 230400 + 156275001 = 480^2 + 12501^2 .

It is not a de Polignac number, because 156505401 - 2¹¹ = 156503353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (156505403) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24391 + ... + 30131.

It is an arithmetic number, because the mean of its divisors is an integer number (10189179).

Almost surely, 2^156505401 is an apocalyptic number.

It is an amenable number.

156505401 is a deficient number, since it is larger than the sum of its proper divisors (88034895).

156505401 is a wasteful number, since it uses less digits than its factorization.

156505401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5993 (or 5990 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 156505401 is about 12510.2118687095. The cubic root of 156505401 is about 538.9019766372.

The spelling of 156505401 in words is "one hundred fifty-six million, five hundred five thousand, four hundred one".