869812057 has 2 divisors, whose sum is σ = 869812058. Its totient is φ = 869812056.

The previous prime is 869812049. The next prime is 869812079. The reversal of 869812057 is 750218968.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 842102361 + 27709696 = 29019^2 + 5264^2 .

It is a cyclic number.

It is not a de Polignac number, because 869812057 - 2³ = 869812049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 869811998 and 869812016.

It is not a weakly prime, because it can be changed into another prime (869812037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434906028 + 434906029.

It is an arithmetic number, because the mean of its divisors is an integer number (434906029).

Almost surely, 2^869812057 is an apocalyptic number.

It is an amenable number.

869812057 is a deficient number, since it is larger than the sum of its proper divisors (1).

869812057 is an equidigital number, since it uses as much as digits as its factorization.

869812057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 46.

The square root of 869812057 is about 29492.5763031987. The cubic root of 869812057 is about 954.5715234733.

The spelling of 869812057 in words is "eight hundred sixty-nine million, eight hundred twelve thousand, fifty-seven".