93311981 has 16 divisors (see below), whose sum is σ = 109572480. Its totient is φ = 77812800.

The previous prime is 93311971. The next prime is 93312001. The reversal of 93311981 is 18911339.

93311981 = T₁₁₈ + T₁₁₉ + ... + T₈₂₄.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-93311981 is a prime.

It is a super-2 number, since 2×93311981² = 17414251596288722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (93311971) 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, 40595 + ... + 42831.

It is an arithmetic number, because the mean of its divisors is an integer number (6848280).

Almost surely, 2^93311981 is an apocalyptic number.

It is an amenable number.

93311981 is a deficient number, since it is larger than the sum of its proper divisors (16260499).

93311981 is a wasteful number, since it uses less digits than its factorization.

93311981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2404.

The product of its digits is 5832, while the sum is 35.

The square root of 93311981 is about 9659.8126793432. The cubic root of 93311981 is about 453.5715471770.

The spelling of 93311981 in words is "ninety-three million, three hundred eleven thousand, nine hundred eighty-one".