81677331 has 6 divisors (see below), whose sum is σ = 117978380. Its totient is φ = 54451548.

The previous prime is 81677329. The next prime is 81677341. The reversal of 81677331 is 13377618.

It is not a de Polignac number, because 81677331 - 2¹ = 81677329 is a prime.

It is a super-2 number, since 2×81677331² = 13342372798567122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81677341) 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 in 5 ways as a sum of consecutive naturals, for example, 4537621 + ... + 4537638.

Almost surely, 2^81677331 is an apocalyptic number.

81677331 is a deficient number, since it is larger than the sum of its proper divisors (36301049).

81677331 is a wasteful number, since it uses less digits than its factorization.

81677331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9075265 (or 9075262 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 81677331 is about 9037.5511616809. The cubic root of 81677331 is about 433.8775500996.

The spelling of 81677331 in words is "eighty-one million, six hundred seventy-seven thousand, three hundred thirty-one".