1622609 has 2 divisors, whose sum is σ = 1622610. Its totient is φ = 1622608.

The previous prime is 1622597. The next prime is 1622617. The reversal of 1622609 is 9062261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1555009 + 67600 = 1247^2 + 260^2 .

It is a cyclic number.

It is not a de Polignac number, because 1622609 - 2²⁰ = 574033 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1622639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 811304 + 811305.

It is an arithmetic number, because the mean of its divisors is an integer number (811305).

2^1622609 is an apocalyptic number.

It is an amenable number.

1622609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1622609 is an equidigital number, since it uses as much as digits as its factorization.

1622609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 1622609 is about 1273.8167058097. The cubic root of 1622609 is about 117.5090441205.

The spelling of 1622609 in words is "one million, six hundred twenty-two thousand, six hundred nine".