90190381 has 4 divisors (see below), whose sum is σ = 90498492. Its totient is φ = 89882272.

The previous prime is 90190363. The next prime is 90190411. The reversal of 90190381 is 18309109.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 81540900 + 8649481 = 9030^2 + 2941^2 .

It is a cyclic number.

It is not a de Polignac number, because 90190381 - 2²⁵ = 56635949 is a prime.

It is a super-2 number, since 2×90190381² = 16268609649850322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90190351) 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, 153616 + ... + 154201.

It is an arithmetic number, because the mean of its divisors is an integer number (22624623).

Almost surely, 2^90190381 is an apocalyptic number.

It is an amenable number.

90190381 is a deficient number, since it is larger than the sum of its proper divisors (308111).

90190381 is a wasteful number, since it uses less digits than its factorization.

90190381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308110.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 90190381 is about 9496.8616395102. The cubic root of 90190381 is about 448.4562425954.

The spelling of 90190381 in words is "ninety million, one hundred ninety thousand, three hundred eighty-one".