507805681 has 2 divisors, whose sum is σ = 507805682. Its totient is φ = 507805680.

The previous prime is 507805673. The next prime is 507805687. The reversal of 507805681 is 186508705.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 382007025 + 125798656 = 19545^2 + 11216^2 .

It is a cyclic number.

It is not a de Polignac number, because 507805681 - 2³ = 507805673 is a prime.

It is a super-2 number, since 2×507805681² = 515733219311747522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (507805687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 253902840 + 253902841.

It is an arithmetic number, because the mean of its divisors is an integer number (253902841).

Almost surely, 2^507805681 is an apocalyptic number.

It is an amenable number.

507805681 is a deficient number, since it is larger than the sum of its proper divisors (1).

507805681 is an equidigital number, since it uses as much as digits as its factorization.

507805681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 67200, while the sum is 40.

The square root of 507805681 is about 22534.5441711165. The cubic root of 507805681 is about 797.8094662813.

The spelling of 507805681 in words is "five hundred seven million, eight hundred five thousand, six hundred eighty-one".