263690081 has 2 divisors, whose sum is σ = 263690082. Its totient is φ = 263690080.

The previous prime is 263690041. The next prime is 263690099. The reversal of 263690081 is 180096362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 148449856 + 115240225 = 12184^2 + 10735^2 .

It is a cyclic number.

It is not a de Polignac number, because 263690081 - 2⁶ = 263690017 is a prime.

It is a super-2 number, since 2×263690081² = 139064917635573122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (263690041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131845040 + 131845041.

It is an arithmetic number, because the mean of its divisors is an integer number (131845041).

Almost surely, 2^263690081 is an apocalyptic number.

It is an amenable number.

263690081 is a deficient number, since it is larger than the sum of its proper divisors (1).

263690081 is an equidigital number, since it uses as much as digits as its factorization.

263690081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 263690081 is about 16238.5369106949. The cubic root of 263690081 is about 641.2557384538.

The spelling of 263690081 in words is "two hundred sixty-three million, six hundred ninety thousand, eighty-one".