81017263 has 2 divisors, whose sum is σ = 81017264. Its totient is φ = 81017262.

The previous prime is 81017249. The next prime is 81017269. The reversal of 81017263 is 36271018.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81017263 is a prime.

It is a super-2 number, since 2×81017263² = 13127593808022338, which contains 22 as substring.

It is equal to p_4725415 and since 81017263 and 4725415 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81017269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40508631 + 40508632.

It is an arithmetic number, because the mean of its divisors is an integer number (40508632).

Almost surely, 2^81017263 is an apocalyptic number.

81017263 is a deficient number, since it is larger than the sum of its proper divisors (1).

81017263 is an equidigital number, since it uses as much as digits as its factorization.

81017263 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 81017263 is about 9000.9590044617. The cubic root of 81017263 is about 432.7056066302.

The spelling of 81017263 in words is "eighty-one million, seventeen thousand, two hundred sixty-three".