90523381 has 4 divisors (see below), whose sum is σ = 97486732. Its totient is φ = 83560032.

The previous prime is 90523373. The next prime is 90523387. The reversal of 90523381 is 18332509.

It is a happy number.

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 38812900 + 51710481 = 6230^2 + 7191^2 .

It is a cyclic number.

It is not a de Polignac number, because 90523381 - 2³ = 90523373 is a prime.

It is a super-2 number, since 2×90523381² = 16388965015342322, 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 (90523387) 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, 3481656 + ... + 3481681.

It is an arithmetic number, because the mean of its divisors is an integer number (24371683).

Almost surely, 2^90523381 is an apocalyptic number.

It is an amenable number.

90523381 is a deficient number, since it is larger than the sum of its proper divisors (6963351).

90523381 is a wasteful number, since it uses less digits than its factorization.

90523381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6963350.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 90523381 is about 9514.3775939365. The cubic root of 90523381 is about 449.0074932240.

The spelling of 90523381 in words is "ninety million, five hundred twenty-three thousand, three hundred eighty-one".