2191437 has 12 divisors (see below), whose sum is σ = 3219840. Its totient is φ = 1435848.

The previous prime is 2191433. The next prime is 2191451. The reversal of 2191437 is 7341912.

It is not a de Polignac number, because 2191437 - 2² = 2191433 is a prime.

It is a super-2 number, since 2×2191437² = 9604792249938, which contains 22 as substring.

It is a d-powerful number, because it can be written as 2⁷ + 1 + 9⁶ + 1 + 4⁸ + 3¹³ + 7 .

It is a self number, because there is not a number n which added to its sum of digits gives 2191437.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191433) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1533 + ... + 2594.

It is an arithmetic number, because the mean of its divisors is an integer number (268320).

2^2191437 is an apocalyptic number.

It is an amenable number.

2191437 is a deficient number, since it is larger than the sum of its proper divisors (1028403).

2191437 is a wasteful number, since it uses less digits than its factorization.

2191437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4192 (or 4189 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 2191437 is about 1480.3502963826. The cubic root of 2191437 is about 129.8901833934.

It can be divided in two parts, 2191 and 437, that added together give a triangular number (2628 = T₇₂).

The spelling of 2191437 in words is "two million, one hundred ninety-one thousand, four hundred thirty-seven".