2091215907 has 32 divisors (see below), whose sum is σ = 3385877760. Its totient is φ = 1265103360.

The previous prime is 2091215891. The next prime is 2091215911. The reversal of 2091215907 is 7095121902.

2091215907 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2091215907 - 2⁴ = 2091215891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2091215957) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 165268 + ... + 177470.

It is an arithmetic number, because the mean of its divisors is an integer number (105808680).

Almost surely, 2^2091215907 is an apocalyptic number.

2091215907 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

2091215907 is a deficient number, since it is larger than the sum of its proper divisors (1294661853).

2091215907 is a wasteful number, since it uses less digits than its factorization.

2091215907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12800 (or 12794 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 36.

The square root of 2091215907 is about 45729.8142025528. The cubic root of 2091215907 is about 1278.7911575061.

The spelling of 2091215907 in words is "two billion, ninety-one million, two hundred fifteen thousand, nine hundred seven".