2191429191 has 16 divisors (see below), whose sum is σ = 3410371584. Its totient is φ = 1225601184.

The previous prime is 2191429189. The next prime is 2191429199. The reversal of 2191429191 is 1919241912.

It is not a de Polignac number, because 2191429191 - 2¹ = 2191429189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191429199) 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, 1109160 + ... + 1111133.

It is an arithmetic number, because the mean of its divisors is an integer number (213148224).

Almost surely, 2^2191429191 is an apocalyptic number.

2191429191 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2191429191 is a deficient number, since it is larger than the sum of its proper divisors (1218942393).

2191429191 is a wasteful number, since it uses less digits than its factorization.

2191429191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2220350.

The product of its digits is 11664, while the sum is 39.

The square root of 2191429191 is about 46812.7033079697. The cubic root of 2191429191 is about 1298.9002910902.

The spelling of 2191429191 in words is "two billion, one hundred ninety-one million, four hundred twenty-nine thousand, one hundred ninety-one".