93990981 has 16 divisors (see below), whose sum is σ = 143360000. Its totient is φ = 53658288.

The previous prime is 93990979. The next prime is 93991003. The reversal of 93990981 is 18909939.

It is not a de Polignac number, because 93990981 - 2¹ = 93990979 is a prime.

It is a super-2 number, since 2×93990981² = 17668609018684722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 93990981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (93995981) 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 15 ways as a sum of consecutive naturals, for example, 40860 + ... + 43098.

It is an arithmetic number, because the mean of its divisors is an integer number (8960000).

Almost surely, 2^93990981 is an apocalyptic number.

It is an amenable number.

93990981 is a deficient number, since it is larger than the sum of its proper divisors (49369019).

93990981 is a wasteful number, since it uses less digits than its factorization.

93990981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4248.

The product of its (nonzero) digits is 157464, while the sum is 48.

The square root of 93990981 is about 9694.8945842644. The cubic root of 93990981 is about 454.6690520993.

The spelling of 93990981 in words is "ninety-three million, nine hundred ninety thousand, nine hundred eighty-one".