869912947 has 2 divisors, whose sum is σ = 869912948. Its totient is φ = 869912946.

The previous prime is 869912941. The next prime is 869912983. The reversal of 869912947 is 749219968.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 869912947 - 2⁷ = 869912819 is a prime.

It is not a weakly prime, because it can be changed into another prime (869912941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434956473 + 434956474.

It is an arithmetic number, because the mean of its divisors is an integer number (434956474).

Almost surely, 2^869912947 is an apocalyptic number.

869912947 is a deficient number, since it is larger than the sum of its proper divisors (1).

869912947 is an equidigital number, since it uses as much as digits as its factorization.

869912947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 55.

The square root of 869912947 is about 29494.2866840342. The cubic root of 869912947 is about 954.6084291462.

The spelling of 869912947 in words is "eight hundred sixty-nine million, nine hundred twelve thousand, nine hundred forty-seven".