81913627 has 2 divisors, whose sum is σ = 81913628. Its totient is φ = 81913626.

The previous prime is 81913619. The next prime is 81913669. The reversal of 81913627 is 72631918.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81913627 - 2³ = 81913619 is a prime.

It is not a weakly prime, because it can be changed into another prime (81913607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40956813 + 40956814.

It is an arithmetic number, because the mean of its divisors is an integer number (40956814).

Almost surely, 2^81913627 is an apocalyptic number.

81913627 is a deficient number, since it is larger than the sum of its proper divisors (1).

81913627 is an equidigital number, since it uses as much as digits as its factorization.

81913627 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 37.

The square root of 81913627 is about 9050.6147305031. The cubic root of 81913627 is about 434.2955560041.

The spelling of 81913627 in words is "eighty-one million, nine hundred thirteen thousand, six hundred twenty-seven".