90518464121 has 4 divisors (see below), whose sum is σ = 93639790500. Its totient is φ = 87397137744.

The previous prime is 90518464109. The next prime is 90518464187. The reversal of 90518464121 is 12146481509.

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 20970225721 + 69548238400 = 144811^2 + 263720^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90518464121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90518464321) 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, 1560663146 + ... + 1560663203.

It is an arithmetic number, because the mean of its divisors is an integer number (23409947625).

Almost surely, 2^90518464121 is an apocalyptic number.

It is an amenable number.

90518464121 is a deficient number, since it is larger than the sum of its proper divisors (3121326379).

90518464121 is a wasteful number, since it uses less digits than its factorization.

90518464121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3121326378.

The product of its (nonzero) digits is 69120, while the sum is 41.

The spelling of 90518464121 in words is "ninety billion, five hundred eighteen million, four hundred sixty-four thousand, one hundred twenty-one".