890165521 has 4 divisors (see below), whose sum is σ = 1017332032. Its totient is φ = 762999012.

The previous prime is 890165483. The next prime is 890165531. The reversal of 890165521 is 125561098.

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 a cyclic number.

It is not a de Polignac number, because 890165521 - 2²³ = 881776913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (890165531) 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, 63583245 + ... + 63583258.

It is an arithmetic number, because the mean of its divisors is an integer number (254333008).

Almost surely, 2^890165521 is an apocalyptic number.

It is an amenable number.

890165521 is a deficient number, since it is larger than the sum of its proper divisors (127166511).

890165521 is a wasteful number, since it uses less digits than its factorization.

890165521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127166510.

The product of its (nonzero) digits is 21600, while the sum is 37.

The square root of 890165521 is about 29835.6417896448. The cubic root of 890165521 is about 961.9597988770.

The spelling of 890165521 in words is "eight hundred ninety million, one hundred sixty-five thousand, five hundred twenty-one".