1625551 has 2 divisors, whose sum is σ = 1625552. Its totient is φ = 1625550.

The previous prime is 1625543. The next prime is 1625573. The reversal of 1625551 is 1555261.

It is a weak prime.

It is an emirp because it is prime and its reverse (1555261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1625551 - 2³ = 1625543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1625501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 812775 + 812776.

It is an arithmetic number, because the mean of its divisors is an integer number (812776).

2^1625551 is an apocalyptic number.

1625551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1625551 is an equidigital number, since it uses as much as digits as its factorization.

1625551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1500, while the sum is 25.

The square root of 1625551 is about 1274.9709800619. The cubic root of 1625551 is about 117.5800209399.

The spelling of 1625551 in words is "one million, six hundred twenty-five thousand, five hundred fifty-one".