2491091520 has 112 divisors (see below), whose sum is σ = 8325551040. Its totient is φ = 629323776.

The previous prime is 2491091507. The next prime is 2491091527. The reversal of 2491091520 is 251901942.

It is a super-2 number, since 2×2491091520² = 12411073922031820800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2491091527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50047 + ... + 86526.

Almost surely, 2^2491091520 is an apocalyptic number.

2491091520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2491091520 is an abundant number, since it is smaller than the sum of its proper divisors (5834459520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2491091520 is a wasteful number, since it uses less digits than its factorization.

2491091520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136612 (or 136602 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 2491091520 is about 49910.8356972712. The cubic root of 2491091520 is about 1355.5948006594.

The spelling of 2491091520 in words is "two billion, four hundred ninety-one million, ninety-one thousand, five hundred twenty".