870731 has 2 divisors, whose sum is σ = 870732. Its totient is φ = 870730.

The previous prime is 870703. The next prime is 870739. The reversal of 870731 is 137078.

870731 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 870731 - 2¹⁰ = 869707 is a prime.

It is a super-2 number, since 2×870731² = 1516344948722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 870731.

It is not a weakly prime, because it can be changed into another prime (870739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435365 + 435366.

It is an arithmetic number, because the mean of its divisors is an integer number (435366).

2⁸⁷⁰⁷³¹ is an apocalyptic number.

870731 is a deficient number, since it is larger than the sum of its proper divisors (1).

870731 is an equidigital number, since it uses as much as digits as its factorization.

870731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 870731 is about 933.1296801624. The cubic root of 870731 is about 95.4907568515.

The spelling of 870731 in words is "eight hundred seventy thousand, seven hundred thirty-one".