90826921 has 4 divisors (see below), whose sum is σ = 90908500. Its totient is φ = 90745344.

The previous prime is 90826919. The next prime is 90826933. The reversal of 90826921 is 12962809.

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 20602521 + 70224400 = 4539^2 + 8380^2 .

It is a cyclic number.

It is not a de Polignac number, because 90826921 - 2¹ = 90826919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90826991) 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, 39096 + ... + 41353.

It is an arithmetic number, because the mean of its divisors is an integer number (22727125).

Almost surely, 2^90826921 is an apocalyptic number.

It is an amenable number.

90826921 is a deficient number, since it is larger than the sum of its proper divisors (81579).

90826921 is a wasteful number, since it uses less digits than its factorization.

90826921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81578.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 90826921 is about 9530.3158919314. The cubic root of 90826921 is about 449.5087990002.

The spelling of 90826921 in words is "ninety million, eight hundred twenty-six thousand, nine hundred twenty-one".