1625629 has 2 divisors, whose sum is σ = 1625630. Its totient is φ = 1625628.

The previous prime is 1625587. The next prime is 1625647. The reversal of 1625629 is 9265261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1625625 + 4 = 1275^2 + 2^2 .

It is an emirp because it is prime and its reverse (9265261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1625629 - 2⁷ = 1625501 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1625629.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1625699) 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, 812814 + 812815.

It is an arithmetic number, because the mean of its divisors is an integer number (812815).

2^1625629 is an apocalyptic number.

It is an amenable number.

1625629 is a deficient number, since it is larger than the sum of its proper divisors (1).

1625629 is an equidigital number, since it uses as much as digits as its factorization.

1625629 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 31.

The square root of 1625629 is about 1275.0015686265. The cubic root of 1625629 is about 117.5819015525.

The spelling of 1625629 in words is "one million, six hundred twenty-five thousand, six hundred twenty-nine".