90821501 has 4 divisors (see below), whose sum is σ = 95601600. Its totient is φ = 86041404.

The previous prime is 90821491. The next prime is 90821513. The reversal of 90821501 is 10512809.

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 90821501 - 2²² = 86627197 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 (90821551) 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 3 ways as a sum of consecutive naturals, for example, 2390021 + ... + 2390058.

It is an arithmetic number, because the mean of its divisors is an integer number (23900400).

Almost surely, 2^90821501 is an apocalyptic number.

It is an amenable number.

90821501 is a deficient number, since it is larger than the sum of its proper divisors (4780099).

90821501 is a wasteful number, since it uses less digits than its factorization.

90821501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4780098.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 90821501 is about 9530.0315319520. The cubic root of 90821501 is about 449.4998575024.

The spelling of 90821501 in words is "ninety million, eight hundred twenty-one thousand, five hundred one".