90840476491 has 4 divisors (see below), whose sum is σ = 90995230872. Its totient is φ = 90685722112.

The previous prime is 90840476453. The next prime is 90840476533. The reversal of 90840476491 is 19467404809.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90840476491 - 2¹¹ = 90840474443 is a prime.

It is a super-2 number, since 2×90840476491² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90840476401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77376310 + ... + 77377483.

It is an arithmetic number, because the mean of its divisors is an integer number (22748807718).

Almost surely, 2^90840476491 is an apocalyptic number.

90840476491 is a deficient number, since it is larger than the sum of its proper divisors (154754381).

90840476491 is a wasteful number, since it uses less digits than its factorization.

90840476491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154754380.

The product of its (nonzero) digits is 1741824, while the sum is 52.

The spelling of 90840476491 in words is "ninety billion, eight hundred forty million, four hundred seventy-six thousand, four hundred ninety-one".