90475421 has 4 divisors (see below), whose sum is σ = 90569952. Its totient is φ = 90380892.

The previous prime is 90475403. The next prime is 90475439. The reversal of 90475421 is 12457409.

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 an interprime number because it is at equal distance from previous prime (90475403) and next prime (90475439).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90475421 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 (90475481) 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, 45815 + ... + 47748.

It is an arithmetic number, because the mean of its divisors is an integer number (22642488).

Almost surely, 2^90475421 is an apocalyptic number.

It is an amenable number.

90475421 is a deficient number, since it is larger than the sum of its proper divisors (94531).

90475421 is an equidigital number, since it uses as much as digits as its factorization.

90475421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94530.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 90475421 is about 9511.8568639357. The cubic root of 90475421 is about 448.9281833143.

The spelling of 90475421 in words is "ninety million, four hundred seventy-five thousand, four hundred twenty-one".