1622641 has 2 divisors, whose sum is σ = 1622642. Its totient is φ = 1622640.

The previous prime is 1622639. The next prime is 1622659. The reversal of 1622641 is 1462261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 848241 + 774400 = 921^2 + 880^2 .

It is a cyclic number.

It is not a de Polignac number, because 1622641 - 2¹ = 1622639 is a prime.

Together with 1622639, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1622671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 811320 + 811321.

It is an arithmetic number, because the mean of its divisors is an integer number (811321).

2^1622641 is an apocalyptic number.

It is an amenable number.

1622641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1622641 is an equidigital number, since it uses as much as digits as its factorization.

1622641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 22.

The square root of 1622641 is about 1273.8292664247. The cubic root of 1622641 is about 117.5098165935.

The spelling of 1622641 in words is "one million, six hundred twenty-two thousand, six hundred forty-one".