85890921 has 4 divisors (see below), whose sum is σ = 114521232. Its totient is φ = 57260612.

The previous prime is 85890913. The next prime is 85890923. The reversal of 85890921 is 12909858.

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 a cyclic number.

It is not a de Polignac number, because 85890921 - 2³ = 85890913 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (85890923) 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, 14315151 + ... + 14315156.

It is an arithmetic number, because the mean of its divisors is an integer number (28630308).

Almost surely, 2^85890921 is an apocalyptic number.

It is an amenable number.

85890921 is a deficient number, since it is larger than the sum of its proper divisors (28630311).

85890921 is a wasteful number, since it uses less digits than its factorization.

85890921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28630310.

The product of its (nonzero) digits is 51840, while the sum is 42.

The square root of 85890921 is about 9267.7354839249. The cubic root of 85890921 is about 441.2137989759.

The spelling of 85890921 in words is "eighty-five million, eight hundred ninety thousand, nine hundred twenty-one".