715531 has 4 divisors (see below), whose sum is σ = 717912. Its totient is φ = 713152.

The previous prime is 715523. The next prime is 715537. The reversal of 715531 is 135517.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135517 = 29 ⋅4673.

It is a cyclic number.

It is not a de Polignac number, because 715531 - 2³ = 715523 is a prime.

It is a super-2 number, since 2×715531² = 1023969223922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (715537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 661 + ... + 1366.

It is an arithmetic number, because the mean of its divisors is an integer number (179478).

2⁷¹⁵⁵³¹ is an apocalyptic number.

715531 is a deficient number, since it is larger than the sum of its proper divisors (2381).

715531 is a wasteful number, since it uses less digits than its factorization.

715531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2380.

The product of its digits is 525, while the sum is 22.

The square root of 715531 is about 845.8906548721. The cubic root of 715531 is about 89.4422710644.

The spelling of 715531 in words is "seven hundred fifteen thousand, five hundred thirty-one".