791531 has 4 divisors (see below), whose sum is σ = 852432. Its totient is φ = 730632.

The previous prime is 791519. The next prime is 791543. The reversal of 791531 is 135197.

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

It is an interprime number because it is at equal distance from previous prime (791519) and next prime (791543).

It is a cyclic number.

It is not a de Polignac number, because 791531 - 2¹⁴ = 775147 is a prime.

It is a super-2 number, since 2×791531² = 1253042647922, 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 791531.

It is not an unprimeable number, because it can be changed into a prime (791561) 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, 30431 + ... + 30456.

It is an arithmetic number, because the mean of its divisors is an integer number (213108).

2⁷⁹¹⁵³¹ is an apocalyptic number.

791531 is a deficient number, since it is larger than the sum of its proper divisors (60901).

791531 is a wasteful number, since it uses less digits than its factorization.

791531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60900.

The product of its digits is 945, while the sum is 26.

The square root of 791531 is about 889.6802796511. The cubic root of 791531 is about 92.5030337452.

The spelling of 791531 in words is "seven hundred ninety-one thousand, five hundred thirty-one".