81133627 has 4 divisors (see below), whose sum is σ = 84661200. Its totient is φ = 77606056.

The previous prime is 81133601. The next prime is 81133631. The reversal of 81133627 is 72633118.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72633118 = 2 ⋅36316559.

It is a cyclic number.

It is not a de Polignac number, because 81133627 - 2²³ = 72745019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81133687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1763752 + ... + 1763797.

It is an arithmetic number, because the mean of its divisors is an integer number (21165300).

Almost surely, 2^81133627 is an apocalyptic number.

81133627 is a deficient number, since it is larger than the sum of its proper divisors (3527573).

81133627 is a wasteful number, since it uses less digits than its factorization.

81133627 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3527572.

The product of its digits is 6048, while the sum is 31.

The square root of 81133627 is about 9007.4206629867. The cubic root of 81133627 is about 432.9126705992.

The spelling of 81133627 in words is "eighty-one million, one hundred thirty-three thousand, six hundred twenty-seven".