731553156 has 18 divisors (see below), whose sum is σ = 1849203902. Its totient is φ = 243851040.

The previous prime is 731553149. The next prime is 731553169. The reversal of 731553156 is 651355137.

731553156 is a `hidden beast` number, since 73 + 1 + 5 + 531 + 56 = 666.

731553156 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 682776900 + 48776256 = 26130^2 + 6984^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 20320921 = 731553156 / (7 + 3 + 1 + 5 + 5 + 3 + 1 + 5 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 731553156.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10160425 + ... + 10160496.

Almost surely, 2^731553156 is an apocalyptic number.

It is an amenable number.

731553156 is an abundant number, since it is smaller than the sum of its proper divisors (1117650746).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

731553156 is a wasteful number, since it uses less digits than its factorization.

731553156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20320931 (or 20320926 counting only the distinct ones).

The product of its digits is 47250, while the sum is 36.

The square root of 731553156 is about 27047.2393415668. The cubic root of 731553156 is about 901.0494572719.

The spelling of 731553156 in words is "seven hundred thirty-one million, five hundred fifty-three thousand, one hundred fifty-six".