2391691 has 2 divisors, whose sum is σ = 2391692. Its totient is φ = 2391690.

The previous prime is 2391671. The next prime is 2391709. The reversal of 2391691 is 1961932.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2391691 - 2¹¹ = 2389643 is a prime.

It is not a weakly prime, because it can be changed into another prime (2391671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1195845 + 1195846.

It is an arithmetic number, because the mean of its divisors is an integer number (1195846).

2^2391691 is an apocalyptic number.

2391691 is a deficient number, since it is larger than the sum of its proper divisors (1).

2391691 is an equidigital number, since it uses as much as digits as its factorization.

2391691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916, while the sum is 31.

The square root of 2391691 is about 1546.5092951547. The cubic root of 2391691 is about 133.7319025212.

The spelling of 2391691 in words is "two million, three hundred ninety-one thousand, six hundred ninety-one".