80625581 has 2 divisors, whose sum is σ = 80625582. Its totient is φ = 80625580.

The previous prime is 80625563. The next prime is 80625617. The reversal of 80625581 is 18552608.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59923081 + 20702500 = 7741^2 + 4550^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80625581 is a prime.

It is a super-2 number, since 2×80625581² = 13000968623175122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80625521) 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, 40312790 + 40312791.

It is an arithmetic number, because the mean of its divisors is an integer number (40312791).

Almost surely, 2^80625581 is an apocalyptic number.

It is an amenable number.

80625581 is a deficient number, since it is larger than the sum of its proper divisors (1).

80625581 is an equidigital number, since it uses as much as digits as its factorization.

80625581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19200, while the sum is 35.

The square root of 80625581 is about 8979.1748507310. The cubic root of 80625581 is about 432.0071675908.

The spelling of 80625581 in words is "eighty million, six hundred twenty-five thousand, five hundred eighty-one".