81525263 has 2 divisors, whose sum is σ = 81525264. Its totient is φ = 81525262.

The previous prime is 81525247. The next prime is 81525277. The reversal of 81525263 is 36252518.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81525263 - 2⁴ = 81525247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81525203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40762631 + 40762632.

It is an arithmetic number, because the mean of its divisors is an integer number (40762632).

Almost surely, 2^81525263 is an apocalyptic number.

81525263 is a deficient number, since it is larger than the sum of its proper divisors (1).

81525263 is an equidigital number, since it uses as much as digits as its factorization.

81525263 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14400, while the sum is 32.

The square root of 81525263 is about 9029.1341223841. The cubic root of 81525263 is about 433.6081163832.

The spelling of 81525263 in words is "eighty-one million, five hundred twenty-five thousand, two hundred sixty-three".