723972531 has 4 divisors (see below), whose sum is σ = 965296712. Its totient is φ = 482648352.

The previous prime is 723972521. The next prime is 723972533. The reversal of 723972531 is 135279327.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 723972531 - 2¹⁵ = 723939763 is a prime.

It is a super-2 number, since 2×723972531² = 1048272451285091922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 723972531.

It is not an unprimeable number, because it can be changed into a prime (723972533) 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, 120662086 + ... + 120662091.

It is an arithmetic number, because the mean of its divisors is an integer number (241324178).

Almost surely, 2^723972531 is an apocalyptic number.

723972531 is a deficient number, since it is larger than the sum of its proper divisors (241324181).

723972531 is a wasteful number, since it uses less digits than its factorization.

723972531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241324180.

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

The square root of 723972531 is about 26906.7376506332. The cubic root of 723972531 is about 897.9263083892.

The spelling of 723972531 in words is "seven hundred twenty-three million, nine hundred seventy-two thousand, five hundred thirty-one".