90989381 has 4 divisors (see below), whose sum is σ = 103987872. Its totient is φ = 77990892.

The previous prime is 90989377. The next prime is 90989441. The reversal of 90989381 is 18398909.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18398909 = 743 ⋅24763.

It is not a de Polignac number, because 90989381 - 2² = 90989377 is a prime.

It is a super-2 number, since 2×90989381² = 16558134909526322, 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 (90989341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6499235 + ... + 6499248.

It is an arithmetic number, because the mean of its divisors is an integer number (25996968).

Almost surely, 2^90989381 is an apocalyptic number.

It is an amenable number.

90989381 is a deficient number, since it is larger than the sum of its proper divisors (12998491).

90989381 is a wasteful number, since it uses less digits than its factorization.

90989381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12998490.

The product of its (nonzero) digits is 139968, while the sum is 47.

The square root of 90989381 is about 9538.8354110971. The cubic root of 90989381 is about 449.7766480081.

The spelling of 90989381 in words is "ninety million, nine hundred eighty-nine thousand, three hundred eighty-one".