731721055 has 64 divisors (see below), whose sum is σ = 1060770816. Its totient is φ = 479232000.

The previous prime is 731721043. The next prime is 731721061. The reversal of 731721055 is 550127137.

It is not a de Polignac number, because 731721055 - 2¹⁷ = 731589983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1404195 + ... + 1404715.

It is an arithmetic number, because the mean of its divisors is an integer number (16574544).

Almost surely, 2^731721055 is an apocalyptic number.

731721055 is a deficient number, since it is larger than the sum of its proper divisors (329049761).

731721055 is a wasteful number, since it uses less digits than its factorization.

731721055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628.

The product of its (nonzero) digits is 7350, while the sum is 31.

The square root of 731721055 is about 27050.3429737961. The cubic root of 731721055 is about 901.1183853824.

The spelling of 731721055 in words is "seven hundred thirty-one million, seven hundred twenty-one thousand, fifty-five".