2191493 has 2 divisors, whose sum is σ = 2191494. Its totient is φ = 2191492.

The previous prime is 2191489. The next prime is 2191507. The reversal of 2191493 is 3941912.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2122849 + 68644 = 1457^2 + 262^2 .

It is a cyclic number.

It is not a de Polignac number, because 2191493 - 2² = 2191489 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2191433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1095746 + 1095747.

It is an arithmetic number, because the mean of its divisors is an integer number (1095747).

2^2191493 is an apocalyptic number.

It is an amenable number.

2191493 is a deficient number, since it is larger than the sum of its proper divisors (1).

2191493 is an equidigital number, since it uses as much as digits as its factorization.

2191493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 29.

The square root of 2191493 is about 1480.3692107039. The cubic root of 2191493 is about 129.8912897890.

The spelling of 2191493 in words is "two million, one hundred ninety-one thousand, four hundred ninety-three".