90540381 has 4 divisors (see below), whose sum is σ = 120720512. Its totient is φ = 60360252.

The previous prime is 90540379. The next prime is 90540389. The reversal of 90540381 is 18304509.

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.

It is not a de Polignac number, because 90540381 - 2¹ = 90540379 is a prime.

It is a super-2 number, since 2×90540381² = 16395121183250322, 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 (90540389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15090061 + ... + 15090066.

It is an arithmetic number, because the mean of its divisors is an integer number (30180128).

Almost surely, 2^90540381 is an apocalyptic number.

It is an amenable number.

90540381 is a deficient number, since it is larger than the sum of its proper divisors (30180131).

90540381 is a wasteful number, since it uses less digits than its factorization.

90540381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30180130.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 90540381 is about 9515.2709367627. The cubic root of 90540381 is about 449.0355988527.

The spelling of 90540381 in words is "ninety million, five hundred forty thousand, three hundred eighty-one".