2991211825 has 12 divisors (see below), whose sum is σ = 4238974720. Its totient is φ = 2051116560.

The previous prime is 2991211807. The next prime is 2991211843. The reversal of 2991211825 is 5281121992.

It is an interprime number because it is at equal distance from previous prime (2991211807) and next prime (2991211843).

It is a de Polignac number, because none of the positive numbers 2^k-2991211825 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8546145 + ... + 8546494.

Almost surely, 2^2991211825 is an apocalyptic number.

2991211825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2991211825 is a deficient number, since it is larger than the sum of its proper divisors (1247762895).

2991211825 is a wasteful number, since it uses less digits than its factorization.

2991211825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17092656 (or 17092651 counting only the distinct ones).

The product of its digits is 25920, while the sum is 40.

The square root of 2991211825 is about 54691.9722171362. The cubic root of 2991211825 is about 1440.8398882823.

The spelling of 2991211825 in words is "two billion, nine hundred ninety-one million, two hundred eleven thousand, eight hundred twenty-five".