81937627 has 2 divisors, whose sum is σ = 81937628. Its totient is φ = 81937626.

The previous prime is 81937613. The next prime is 81937651. The reversal of 81937627 is 72673918.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81937627 is a prime.

It is a super-2 number, since 2×81937627² = 13427549436782258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (81937657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40968813 + 40968814.

It is an arithmetic number, because the mean of its divisors is an integer number (40968814).

Almost surely, 2^81937627 is an apocalyptic number.

81937627 is a deficient number, since it is larger than the sum of its proper divisors (1).

81937627 is an equidigital number, since it uses as much as digits as its factorization.

81937627 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 43.

The square root of 81937627 is about 9051.9405101890. The cubic root of 81937627 is about 434.3379668374.

The spelling of 81937627 in words is "eighty-one million, nine hundred thirty-seven thousand, six hundred twenty-seven".