90204901 has 4 divisors (see below), whose sum is σ = 90400192. Its totient is φ = 90009612.

The previous prime is 90204899. The next prime is 90204911. The reversal of 90204901 is 10940209.

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, and also an emirpimes, since its reverse is a distinct semiprime: 10940209 = 7 ⋅1562887.

It is a cyclic number.

It is not a de Polignac number, because 90204901 - 2¹ = 90204899 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 (90204911) 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, 96951 + ... + 97876.

It is an arithmetic number, because the mean of its divisors is an integer number (22600048).

Almost surely, 2^90204901 is an apocalyptic number.

It is an amenable number.

90204901 is a deficient number, since it is larger than the sum of its proper divisors (195291).

90204901 is a wasteful number, since it uses less digits than its factorization.

90204901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195290.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 90204901 is about 9497.6260718139. The cubic root of 90204901 is about 448.4803073762.

The spelling of 90204901 in words is "ninety million, two hundred four thousand, nine hundred one".