816263501 has 2 divisors, whose sum is σ = 816263502. Its totient is φ = 816263500.

The previous prime is 816263467. The next prime is 816263531. The reversal of 816263501 is 105362618.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 548777476 + 267486025 = 23426^2 + 16355^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-816263501 is a prime.

It is a super-2 number, since 2×816263501² = 1332572206129554002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (816263531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408131750 + 408131751.

It is an arithmetic number, because the mean of its divisors is an integer number (408131751).

Almost surely, 2^816263501 is an apocalyptic number.

It is an amenable number.

816263501 is a deficient number, since it is larger than the sum of its proper divisors (1).

816263501 is an equidigital number, since it uses as much as digits as its factorization.

816263501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 816263501 is about 28570.3255319221. The cubic root of 816263501 is about 934.5663200824.

The spelling of 816263501 in words is "eight hundred sixteen million, two hundred sixty-three thousand, five hundred one".