90641021 has 8 divisors (see below), whose sum is σ = 92103000. Its totient is φ = 89190720.

The previous prime is 90641011. The next prime is 90641027. The reversal of 90641021 is 12014609.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2937796 + 87703225 = 1714^2 + 9365^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90641021 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 (90641027) 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, 13451 + ... + 19031.

It is an arithmetic number, because the mean of its divisors is an integer number (11512875).

Almost surely, 2^90641021 is an apocalyptic number.

It is an amenable number.

90641021 is a deficient number, since it is larger than the sum of its proper divisors (1461979).

90641021 is a wasteful number, since it uses less digits than its factorization.

90641021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5839.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 90641021 is about 9520.5578092883. The cubic root of 90641021 is about 449.2019121542.

The spelling of 90641021 in words is "ninety million, six hundred forty-one thousand, twenty-one".