90921559 has 8 divisors (see below), whose sum is σ = 98618688. Its totient is φ = 83485440.

The previous prime is 90921541. The next prime is 90921569. The reversal of 90921559 is 95512909.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90921559 - 2¹¹ = 90919511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90921569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64527 + ... + 65920.

It is an arithmetic number, because the mean of its divisors is an integer number (12327336).

Almost surely, 2^90921559 is an apocalyptic number.

90921559 is a deficient number, since it is larger than the sum of its proper divisors (7697129).

90921559 is a wasteful number, since it uses less digits than its factorization.

90921559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130505.

The product of its (nonzero) digits is 36450, while the sum is 40.

The square root of 90921559 is about 9535.2797022426. The cubic root of 90921559 is about 449.6648681722.

The spelling of 90921559 in words is "ninety million, nine hundred twenty-one thousand, five hundred fifty-nine".