870931 has 2 divisors, whose sum is σ = 870932. Its totient is φ = 870930.

The previous prime is 870929. The next prime is 870953. The reversal of 870931 is 139078.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 870931 - 2¹ = 870929 is a prime.

It is a super-2 number, since 2×870931² = 1517041613522, which contains 22 as substring.

Together with 870929, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 870931.

It is not a weakly prime, because it can be changed into another prime (870901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435465 + 435466.

It is an arithmetic number, because the mean of its divisors is an integer number (435466).

2⁸⁷⁰⁹³¹ is an apocalyptic number.

870931 is a deficient number, since it is larger than the sum of its proper divisors (1).

870931 is an equidigital number, since it uses as much as digits as its factorization.

870931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 870931 is about 933.2368402501. The cubic root of 870931 is about 95.4980674481.

The spelling of 870931 in words is "eight hundred seventy thousand, nine hundred thirty-one".