90002921 has 4 divisors (see below), whose sum is σ = 93106500. Its totient is φ = 86899344.

The previous prime is 90002911. The next prime is 90002923. The reversal of 90002921 is 12920009.

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

It can be written as a sum of positive squares in 2 ways, for example, as 34351321 + 55651600 = 5861^2 + 7460^2 .

It is a cyclic number.

It is not a de Polignac number, because 90002921 - 2¹⁴ = 89986537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90002923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1551746 + ... + 1551803.

It is an arithmetic number, because the mean of its divisors is an integer number (23276625).

Almost surely, 2^90002921 is an apocalyptic number.

It is an amenable number.

90002921 is a deficient number, since it is larger than the sum of its proper divisors (3103579).

90002921 is a wasteful number, since it uses less digits than its factorization.

90002921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3103578.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 90002921 is about 9486.9869294734. The cubic root of 90002921 is about 448.1453228193.

The spelling of 90002921 in words is "ninety million, two thousand, nine hundred twenty-one".