90909255973 has 4 divisors (see below), whose sum is σ = 92450090880. Its totient is φ = 89368421068.

The previous prime is 90909255971. The next prime is 90909256001. The reversal of 90909255973 is 37955290909.

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 not a de Polignac number, because 90909255973 - 2¹ = 90909255971 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90909255971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 770417365 + ... + 770417482.

It is an arithmetic number, because the mean of its divisors is an integer number (23112522720).

Almost surely, 2^90909255973 is an apocalyptic number.

It is an amenable number.

90909255973 is a deficient number, since it is larger than the sum of its proper divisors (1540834907).

90909255973 is a wasteful number, since it uses less digits than its factorization.

90909255973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1540834906.

The product of its (nonzero) digits is 6889050, while the sum is 58.

The spelling of 90909255973 in words is "ninety billion, nine hundred nine million, two hundred fifty-five thousand, nine hundred seventy-three".