2191138 has 4 divisors (see below), whose sum is σ = 3286710. Its totient is φ = 1095568.

The previous prime is 2191127. The next prime is 2191159. The reversal of 2191138 is 8311912.

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., 1530169 + 660969 = 1237^2 + 813^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 547783 + ... + 547786.

2^2191138 is an apocalyptic number.

2191138 is a deficient number, since it is larger than the sum of its proper divisors (1095572).

2191138 is a wasteful number, since it uses less digits than its factorization.

2191138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1095571.

The product of its digits is 432, while the sum is 25.

The square root of 2191138 is about 1480.2493033270. The cubic root of 2191138 is about 129.8842757126.

The spelling of 2191138 in words is "two million, one hundred ninety-one thousand, one hundred thirty-eight".