93971681 has 4 divisors (see below), whose sum is σ = 94041792. Its totient is φ = 93901572.

The previous prime is 93971627. The next prime is 93971707. The reversal of 93971681 is 18617939.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 93971681 - 2¹⁴ = 93955297 is a prime.

It is a super-2 number, since 2×93971681² = 17661353659931522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (93971621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33005 + ... + 35738.

It is an arithmetic number, because the mean of its divisors is an integer number (23510448).

Almost surely, 2^93971681 is an apocalyptic number.

It is an amenable number.

93971681 is a deficient number, since it is larger than the sum of its proper divisors (70111).

93971681 is a wasteful number, since it uses less digits than its factorization.

93971681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70110.

The product of its digits is 81648, while the sum is 44.

The square root of 93971681 is about 9693.8991639072. The cubic root of 93971681 is about 454.6379295621.

The spelling of 93971681 in words is "ninety-three million, nine hundred seventy-one thousand, six hundred eighty-one".