93981681 has 16 divisors (see below), whose sum is σ = 139413120. Its totient is φ = 62573040.

The previous prime is 93981673. The next prime is 93981683. The reversal of 93981681 is 18618939.

It is not a de Polignac number, because 93981681 - 2³ = 93981673 is a prime.

It is a super-2 number, since 2×93981681² = 17665112727171522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (93981683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24771 + ... + 28311.

It is an arithmetic number, because the mean of its divisors is an integer number (8713320).

Almost surely, 2^93981681 is an apocalyptic number.

It is an amenable number.

93981681 is a deficient number, since it is larger than the sum of its proper divisors (45431439).

93981681 is a wasteful number, since it uses less digits than its factorization.

93981681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4533 (or 4527 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 93981681 is about 9694.4149385097. The cubic root of 93981681 is about 454.6540557609.

The spelling of 93981681 in words is "ninety-three million, nine hundred eighty-one thousand, six hundred eighty-one".