1625539 has 2 divisors, whose sum is σ = 1625540. Its totient is φ = 1625538.

The previous prime is 1625513. The next prime is 1625543. The reversal of 1625539 is 9355261.

1625539 = 518² + 519² + ... + 523².

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1625539 - 2⁹ = 1625027 is a prime.

1625539 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1625539.

It is not a weakly prime, because it can be changed into another prime (1625339) 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, 812769 + 812770.

It is an arithmetic number, because the mean of its divisors is an integer number (812770).

2^1625539 is an apocalyptic number.

1625539 is a deficient number, since it is larger than the sum of its proper divisors (1).

1625539 is an equidigital number, since it uses as much as digits as its factorization.

1625539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8100, while the sum is 31.

The square root of 1625539 is about 1274.9662740637. The cubic root of 1625539 is about 117.5797316096.

The spelling of 1625539 in words is "one million, six hundred twenty-five thousand, five hundred thirty-nine".