90541821 has 16 divisors (see below), whose sum is σ = 128691200. Its totient is φ = 56457648.

The previous prime is 90541819. The next prime is 90541877. The reversal of 90541821 is 12814509.

It is a happy number.

It is not a de Polignac number, because 90541821 - 2¹ = 90541819 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 (90541721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5551 + ... + 14556.

It is an arithmetic number, because the mean of its divisors is an integer number (8043200).

Almost surely, 2^90541821 is an apocalyptic number.

It is an amenable number.

90541821 is a deficient number, since it is larger than the sum of its proper divisors (38149379).

90541821 is a wasteful number, since it uses less digits than its factorization.

90541821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20208.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 90541821 is about 9515.3466043019. The cubic root of 90541821 is about 449.0379794032.

The spelling of 90541821 in words is "ninety million, five hundred forty-one thousand, eight hundred twenty-one".