90570981 has 4 divisors (see below), whose sum is σ = 120761312. Its totient is φ = 60380652.

The previous prime is 90570979. The next prime is 90570989. The reversal of 90570981 is 18907509.

It is a happy number.

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 90570981 - 2¹ = 90570979 is a prime.

It is a super-2 number, since 2×90570981² = 16406205198604722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90570989) 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, 15095161 + ... + 15095166.

It is an arithmetic number, because the mean of its divisors is an integer number (30190328).

Almost surely, 2^90570981 is an apocalyptic number.

It is an amenable number.

90570981 is a deficient number, since it is larger than the sum of its proper divisors (30190331).

90570981 is a wasteful number, since it uses less digits than its factorization.

90570981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30190330.

The product of its (nonzero) digits is 22680, while the sum is 39.

The square root of 90570981 is about 9516.8787425290. The cubic root of 90570981 is about 449.0861801201.

The spelling of 90570981 in words is "ninety million, five hundred seventy thousand, nine hundred eighty-one".