807997081 has 2 divisors, whose sum is σ = 807997082. Its totient is φ = 807997080.

The previous prime is 807997049. The next prime is 807997103. The reversal of 807997081 is 180799708.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 777294400 + 30702681 = 27880^2 + 5541^2 .

It is a cyclic number.

It is not a de Polignac number, because 807997081 - 2⁵ = 807997049 is a prime.

It is a super-2 number, since 2×807997081² = 1305718565809041122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (807997181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 403998540 + 403998541.

It is an arithmetic number, because the mean of its divisors is an integer number (403998541).

Almost surely, 2^807997081 is an apocalyptic number.

It is an amenable number.

807997081 is a deficient number, since it is larger than the sum of its proper divisors (1).

807997081 is an equidigital number, since it uses as much as digits as its factorization.

807997081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 49.

The square root of 807997081 is about 28425.2894620266. The cubic root of 807997081 is about 931.4007799579.

The spelling of 807997081 in words is "eight hundred seven million, nine hundred ninety-seven thousand, eighty-one".