869894731 has 2 divisors, whose sum is σ = 869894732. Its totient is φ = 869894730.

The previous prime is 869894717. The next prime is 869894737. The reversal of 869894731 is 137498968.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 869894731 - 2⁹ = 869894219 is a prime.

It is a super-2 number, since 2×869894731² = 1513433686043124722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (869894737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434947365 + 434947366.

It is an arithmetic number, because the mean of its divisors is an integer number (434947366).

Almost surely, 2^869894731 is an apocalyptic number.

869894731 is a deficient number, since it is larger than the sum of its proper divisors (1).

869894731 is an equidigital number, since it uses as much as digits as its factorization.

869894731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2612736, while the sum is 55.

The square root of 869894731 is about 29493.9778768480. The cubic root of 869894731 is about 954.6017659244.

The spelling of 869894731 in words is "eight hundred sixty-nine million, eight hundred ninety-four thousand, seven hundred thirty-one".