2191041207 has 6 divisors (see below), whose sum is σ = 3164837312. Its totient is φ = 1460694132.

The previous prime is 2191041187. The next prime is 2191041217. The reversal of 2191041207 is 7021401912.

It is not a de Polignac number, because 2191041207 - 2⁷ = 2191041079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191041217) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 121724503 + ... + 121724520.

Almost surely, 2^2191041207 is an apocalyptic number.

2191041207 is a deficient number, since it is larger than the sum of its proper divisors (973796105).

2191041207 is a wasteful number, since it uses less digits than its factorization.

2191041207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243449029 (or 243449026 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 2191041207 is about 46808.5591211693. The cubic root of 2191041207 is about 1298.8236314873.

The spelling of 2191041207 in words is "two billion, one hundred ninety-one million, forty-one thousand, two hundred seven".