1625400217 has 12 divisors (see below), whose sum is σ = 1891543860. Its totient is φ = 1392631296.

The previous prime is 1625400197. The next prime is 1625400223. The reversal of 1625400217 is 7120045261.

It can be written as a sum of positive squares in 2 ways, for example, as 414081801 + 1211318416 = 20349^2 + 34804^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1625400217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1625460217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 152073 + ... + 162409.

It is an arithmetic number, because the mean of its divisors is an integer number (157628655).

Almost surely, 2^1625400217 is an apocalyptic number.

It is an amenable number.

1625400217 is a deficient number, since it is larger than the sum of its proper divisors (266143643).

1625400217 is a wasteful number, since it uses less digits than its factorization.

1625400217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13560 (or 13553 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 1625400217 is about 40316.2525168201. The cubic root of 1625400217 is about 1175.7638532829.

Adding to 1625400217 its reverse (7120045261), we get a palindrome (8745445478).

The spelling of 1625400217 in words is "one billion, six hundred twenty-five million, four hundred thousand, two hundred seventeen".