810700057 has 2 divisors, whose sum is σ = 810700058. Its totient is φ = 810700056.

The previous prime is 810700049. The next prime is 810700069. The reversal of 810700057 is 750007018.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 424813321 + 385886736 = 20611^2 + 19644^2 .

It is a cyclic number.

It is not a de Polignac number, because 810700057 - 2³ = 810700049 is a prime.

It is equal to p_41668300 and since 810700057 and 41668300 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 810699998 and 810700034.

It is not a weakly prime, because it can be changed into another prime (810700157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405350028 + 405350029.

It is an arithmetic number, because the mean of its divisors is an integer number (405350029).

Almost surely, 2^810700057 is an apocalyptic number.

It is an amenable number.

810700057 is a deficient number, since it is larger than the sum of its proper divisors (1).

810700057 is an equidigital number, since it uses as much as digits as its factorization.

810700057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1960, while the sum is 28.

The square root of 810700057 is about 28472.7950331540. The cubic root of 810700057 is about 932.4382225891.

The spelling of 810700057 in words is "eight hundred ten million, seven hundred thousand, fifty-seven".