1213591 has 2 divisors, whose sum is σ = 1213592. Its totient is φ = 1213590.

The previous prime is 1213577. The next prime is 1213601. The reversal of 1213591 is 1953121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1213591 - 2¹¹ = 1211543 is a prime.

It is a Chen prime.

1213591 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606795 + 606796.

It is an arithmetic number, because the mean of its divisors is an integer number (606796).

2^1213591 is an apocalyptic number.

1213591 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213591 is an equidigital number, since it uses as much as digits as its factorization.

1213591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 270, while the sum is 22.

The square root of 1213591 is about 1101.6310634691. The cubic root of 1213591 is about 106.6655349272.

The spelling of 1213591 in words is "one million, two hundred thirteen thousand, five hundred ninety-one".