805531 has 2 divisors, whose sum is σ = 805532. Its totient is φ = 805530.

The previous prime is 805523. The next prime is 805537. The reversal of 805531 is 135508.

805531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 805531 - 2³ = 805523 is a prime.

It is a super-2 number, since 2×805531² = 1297760383922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (805537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402765 + 402766.

It is an arithmetic number, because the mean of its divisors is an integer number (402766).

2⁸⁰⁵⁵³¹ is an apocalyptic number.

805531 is a deficient number, since it is larger than the sum of its proper divisors (1).

805531 is an equidigital number, since it uses as much as digits as its factorization.

805531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 805531 is about 897.5137881949. The cubic root of 805531 is about 93.0452240834.

The spelling of 805531 in words is "eight hundred five thousand, five hundred thirty-one".