731375661 has 4 divisors (see below), whose sum is σ = 975167552. Its totient is φ = 487583772.

The previous prime is 731375657. The next prime is 731375693. The reversal of 731375661 is 166573137.

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 not a de Polignac number, because 731375661 - 2² = 731375657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (731305661) 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 3 ways as a sum of consecutive naturals, for example, 121895941 + ... + 121895946.

It is an arithmetic number, because the mean of its divisors is an integer number (243791888).

Almost surely, 2^731375661 is an apocalyptic number.

It is an amenable number.

731375661 is a deficient number, since it is larger than the sum of its proper divisors (243791891).

731375661 is a wasteful number, since it uses less digits than its factorization.

731375661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243791890.

The product of its digits is 79380, while the sum is 39.

The square root of 731375661 is about 27043.9579388817. The cubic root of 731375661 is about 900.9765782161.

The spelling of 731375661 in words is "seven hundred thirty-one million, three hundred seventy-five thousand, six hundred sixty-one".