90093981 has 8 divisors (see below), whose sum is σ = 124267680. Its totient is φ = 57991472.

The previous prime is 90093977. The next prime is 90094009. The reversal of 90093981 is 18939009.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90093981 - 2² = 90093977 is a prime.

It is a super-2 number, since 2×90093981² = 16233850824856722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90093911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 517695 + ... + 517868.

It is an arithmetic number, because the mean of its divisors is an integer number (15533460).

Almost surely, 2^90093981 is an apocalyptic number.

It is an amenable number.

90093981 is a deficient number, since it is larger than the sum of its proper divisors (34173699).

90093981 is a wasteful number, since it uses less digits than its factorization.

90093981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1035595.

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 90093981 is about 9491.7849217099. The cubic root of 90093981 is about 448.2964081319.

The spelling of 90093981 in words is "ninety million, ninety-three thousand, nine hundred eighty-one".