90021311 has 4 divisors (see below), whose sum is σ = 90052512. Its totient is φ = 89990112.

The previous prime is 90021271. The next prime is 90021313. The reversal of 90021311 is 11312009.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90021311 - 2¹⁴ = 90004927 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90021311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90021313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10775 + ... + 17208.

It is an arithmetic number, because the mean of its divisors is an integer number (22513128).

Almost surely, 2^90021311 is an apocalyptic number.

90021311 is a deficient number, since it is larger than the sum of its proper divisors (31201).

90021311 is a wasteful number, since it uses less digits than its factorization.

90021311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31200.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 90021311 is about 9487.9561023436. The cubic root of 90021311 is about 448.1758434259.

The spelling of 90021311 in words is "ninety million, twenty-one thousand, three hundred eleven".