90381381 has 8 divisors (see below), whose sum is σ = 121248480. Its totient is φ = 59884272.

The previous prime is 90381349. The next prime is 90381397. The reversal of 90381381 is 18318309.

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

It is not a de Polignac number, because 90381381 - 2⁵ = 90381349 is a prime.

It is a super-2 number, since 2×90381381² = 16337588062934322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90381301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91926 + ... + 92903.

It is an arithmetic number, because the mean of its divisors is an integer number (15156060).

Almost surely, 2^90381381 is an apocalyptic number.

It is an amenable number.

90381381 is a deficient number, since it is larger than the sum of its proper divisors (30867099).

90381381 is a wasteful number, since it uses less digits than its factorization.

90381381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184995.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 90381381 is about 9506.9122747609. The cubic root of 90381381 is about 448.7725909955.

The spelling of 90381381 in words is "ninety million, three hundred eighty-one thousand, three hundred eighty-one".