2191488623 has 4 divisors (see below), whose sum is σ = 2227414728. Its totient is φ = 2155562520.

The previous prime is 2191488589. The next prime is 2191488641. The reversal of 2191488623 is 3268841912.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2191488623 - 2¹² = 2191484527 is a prime.

It is a super-2 number, since 2×2191488623² = 9605244769476872258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191488643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17962961 + ... + 17963082.

It is an arithmetic number, because the mean of its divisors is an integer number (556853682).

Almost surely, 2^2191488623 is an apocalyptic number.

2191488623 is a deficient number, since it is larger than the sum of its proper divisors (35926105).

2191488623 is an equidigital number, since it uses as much as digits as its factorization.

2191488623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35926104.

The product of its digits is 165888, while the sum is 44.

The square root of 2191488623 is about 46813.3380886260. The cubic root of 2191488623 is about 1298.9120331297.

The spelling of 2191488623 in words is "two billion, one hundred ninety-one million, four hundred eighty-eight thousand, six hundred twenty-three".