90825421 has 4 divisors (see below), whose sum is σ = 90859132. Its totient is φ = 90791712.

The previous prime is 90825353. The next prime is 90825437. The reversal of 90825421 is 12452809.

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 56836521 + 33988900 = 7539^2 + 5830^2 .

It is a cyclic number.

It is not a de Polignac number, because 90825421 - 2¹¹ = 90823373 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 (90825461) 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, 12426 + ... + 18331.

It is an arithmetic number, because the mean of its divisors is an integer number (22714783).

Almost surely, 2^90825421 is an apocalyptic number.

It is an amenable number.

90825421 is a deficient number, since it is larger than the sum of its proper divisors (33711).

90825421 is a wasteful number, since it uses less digits than its factorization.

90825421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33710.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 90825421 is about 9530.2371953693. The cubic root of 90825421 is about 449.5063244516.

The spelling of 90825421 in words is "ninety million, eight hundred twenty-five thousand, four hundred twenty-one".