1625849391 has 16 divisors (see below), whose sum is σ = 2184510560. Its totient is φ = 1075576320.

The previous prime is 1625849387. The next prime is 1625849413. The reversal of 1625849391 is 1939485261.

It is not a de Polignac number, because 1625849391 - 2² = 1625849387 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1625849391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1625849321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 211251 + ... + 218811.

It is an arithmetic number, because the mean of its divisors is an integer number (136531910).

Almost surely, 2^1625849391 is an apocalyptic number.

1625849391 is a deficient number, since it is larger than the sum of its proper divisors (558661169).

1625849391 is a wasteful number, since it uses less digits than its factorization.

1625849391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8106.

The product of its digits is 466560, while the sum is 48.

The square root of 1625849391 is about 40321.8227638583. The cubic root of 1625849391 is about 1175.8721494647.

The spelling of 1625849391 in words is "one billion, six hundred twenty-five million, eight hundred forty-nine thousand, three hundred ninety-one".