93981 has 4 divisors (see below), whose sum is σ = 125312. Its totient is φ = 62652.

The previous prime is 93979. The next prime is 93983. The reversal of 93981 is 18939.

It is a happy number.

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 an interprime number because it is at equal distance from previous prime (93979) and next prime (93983).

It is not a de Polignac number, because 93981 - 2¹ = 93979 is a prime.

It is a super-2 number, since 2×93981² = 17664856722, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 93981.

It is not an unprimeable number, because it can be changed into a prime (93983) 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, 15661 + ... + 15666.

It is an arithmetic number, because the mean of its divisors is an integer number (31328).

2⁹³⁹⁸¹ is an apocalyptic number.

It is an amenable number.

93981 is a deficient number, since it is larger than the sum of its proper divisors (31331).

93981 is a wasteful number, since it uses less digits than its factorization.

93981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31330.

The product of its digits is 1944, while the sum is 30.

The square root of 93981 is about 306.5632071857. The cubic root of 93981 is about 45.4652957603.

The spelling of 93981 in words is "ninety-three thousand, nine hundred eighty-one".