1622591 has 2 divisors, whose sum is σ = 1622592. Its totient is φ = 1622590.

The previous prime is 1622587. The next prime is 1622597. The reversal of 1622591 is 1952261.

It is a weak prime.

It is an emirp because it is prime and its reverse (1952261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1622591 - 2² = 1622587 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1622591.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1622597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 811295 + 811296.

It is an arithmetic number, because the mean of its divisors is an integer number (811296).

2^1622591 is an apocalyptic number.

1622591 is a deficient number, since it is larger than the sum of its proper divisors (1).

1622591 is an equidigital number, since it uses as much as digits as its factorization.

1622591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 26.

The square root of 1622591 is about 1273.8096404094. The cubic root of 1622591 is about 117.5086096000.

The spelling of 1622591 in words is "one million, six hundred twenty-two thousand, five hundred ninety-one".