90767513521 has 8 divisors (see below), whose sum is σ = 90862698024. Its totient is φ = 90672366720.

The previous prime is 90767513503. The next prime is 90767513539. The reversal of 90767513521 is 12531576709.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (90767513503) and next prime (90767513539).

It can be written as a sum of positive squares in 4 ways, for example, as 38159669025 + 52607844496 = 195345^2 + 229364^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90767513521 - 2⁵ = 90767513489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90767513821) 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 7 ways as a sum of consecutive naturals, for example, 8357931 + ... + 8368783.

It is an arithmetic number, because the mean of its divisors is an integer number (11357837253).

Almost surely, 2^90767513521 is an apocalyptic number.

It is an amenable number.

90767513521 is a deficient number, since it is larger than the sum of its proper divisors (95184503).

90767513521 is a wasteful number, since it uses less digits than its factorization.

90767513521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18851.

The product of its (nonzero) digits is 396900, while the sum is 46.

The spelling of 90767513521 in words is "ninety billion, seven hundred sixty-seven million, five hundred thirteen thousand, five hundred twenty-one".