2191794501 has 16 divisors (see below), whose sum is σ = 3148589696. Its totient is φ = 1348197696.

The previous prime is 2191794467. The next prime is 2191794511. The reversal of 2191794501 is 1054971912.

It is not a de Polignac number, because 2191794501 - 2²⁶ = 2124685637 is a prime.

It is a super-2 number, since 2×2191794501² = 9607926269227678002, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2191794501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191794511) 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, 86391 + ... + 108843.

It is an arithmetic number, because the mean of its divisors is an integer number (196786856).

Almost surely, 2^2191794501 is an apocalyptic number.

It is an amenable number.

2191794501 is a deficient number, since it is larger than the sum of its proper divisors (956795195).

2191794501 is a wasteful number, since it uses less digits than its factorization.

2191794501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24972.

The product of its (nonzero) digits is 22680, while the sum is 39.

The square root of 2191794501 is about 46816.6049708861. The cubic root of 2191794501 is about 1298.9724623933.

The spelling of 2191794501 in words is "two billion, one hundred ninety-one million, seven hundred ninety-four thousand, five hundred one".