90598421 has 4 divisors (see below), whose sum is σ = 91290144. Its totient is φ = 89906700.

The previous prime is 90598381. The next prime is 90598439. The reversal of 90598421 is 12489509.

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 a de Polignac number, because none of the positive numbers 2^k-90598421 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 (90598471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 345665 + ... + 345926.

It is an arithmetic number, because the mean of its divisors is an integer number (22822536).

Almost surely, 2^90598421 is an apocalyptic number.

It is an amenable number.

90598421 is a deficient number, since it is larger than the sum of its proper divisors (691723).

90598421 is a wasteful number, since it uses less digits than its factorization.

90598421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691722.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 90598421 is about 9518.3202824868. The cubic root of 90598421 is about 449.1315282746.

It can be divided in two parts, 90598 and 421, that added together give a palindrome (91019).

The spelling of 90598421 in words is "ninety million, five hundred ninety-eight thousand, four hundred twenty-one".