2191595954 has 4 divisors (see below), whose sum is σ = 3287393934. Its totient is φ = 1095797976.

The previous prime is 2191595893. The next prime is 2191595969. The reversal of 2191595954 is 4595951912.

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

It can be written as a sum of positive squares in only one way, i.e., 1586189929 + 605406025 = 39827^2 + 24605^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 547898987 + ... + 547898990.

Almost surely, 2^2191595954 is an apocalyptic number.

2191595954 is a deficient number, since it is larger than the sum of its proper divisors (1095797980).

2191595954 is a wasteful number, since it uses less digits than its factorization.

2191595954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1095797979.

The product of its digits is 729000, while the sum is 50.

The square root of 2191595954 is about 46814.4844465898. The cubic root of 2191595954 is about 1298.9332380844.

The spelling of 2191595954 in words is "two billion, one hundred ninety-one million, five hundred ninety-five thousand, nine hundred fifty-four".