90237100561 has 4 divisors (see below), whose sum is σ = 90293465124. Its totient is φ = 90180736000.

The previous prime is 90237100517. The next prime is 90237100571. The reversal of 90237100561 is 16500173209.

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 85801540561 + 4435560000 = 292919^2 + 66600^2 .

It is a cyclic number.

It is not a de Polignac number, because 90237100561 - 2⁷ = 90237100433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90237100571) 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, 28179880 + ... + 28183081.

It is an arithmetic number, because the mean of its divisors is an integer number (22573366281).

Almost surely, 2^90237100561 is an apocalyptic number.

It is an amenable number.

90237100561 is a deficient number, since it is larger than the sum of its proper divisors (56364563).

90237100561 is a wasteful number, since it uses less digits than its factorization.

90237100561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56364562.

The product of its (nonzero) digits is 11340, while the sum is 34.

The spelling of 90237100561 in words is "ninety billion, two hundred thirty-seven million, one hundred thousand, five hundred sixty-one".