1080918087491 has 4 divisors (see below), whose sum is σ = 1179183368184. Its totient is φ = 982652806800.

The previous prime is 1080918087479. The next prime is 1080918087499. The reversal of 1080918087491 is 1947808190801.

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 1080918087491 - 2³⁰ = 1079844345667 is a prime.

It is a super-2 number, since 2×1080918087491² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1080918087499) 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, 49132640330 + ... + 49132640351.

It is an arithmetic number, because the mean of its divisors is an integer number (294795842046).

Almost surely, 2^{1080918087491} is an apocalyptic number.

1080918087491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1080918087491 is a deficient number, since it is larger than the sum of its proper divisors (98265280693).

1080918087491 is an equidigital number, since it uses as much as digits as its factorization.

1080918087491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98265280692.

The product of its (nonzero) digits is 1161216, while the sum is 56.

The spelling of 1080918087491 in words is "one trillion, eighty billion, nine hundred eighteen million, eighty-seven thousand, four hundred ninety-one".