1611420625 has 10 divisors (see below), whose sum is σ = 2013631994. Its totient is φ = 1289136000.

The previous prime is 1611420619. The next prime is 1611420637. The reversal of 1611420625 is 5260241161.

It can be written as a sum of positive squares in 5 ways, for example, as 426959569 + 1184461056 = 20663^2 + 34416^2 .

It is not a de Polignac number, because 1611420625 - 2⁵ = 1611420593 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1611420593 and 1611420602.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1288512 + ... + 1289761.

Almost surely, 2^1611420625 is an apocalyptic number.

It is an amenable number.

1611420625 is a deficient number, since it is larger than the sum of its proper divisors (402211369).

1611420625 is an frugal number, since it uses more digits than its factorization.

1611420625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2578293 (or 2578278 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 1611420625 is about 40142.5039702309. The cubic root of 1611420625 is about 1172.3833427155.

Adding to 1611420625 its reverse (5260241161), we get a palindrome (6871661786).

The spelling of 1611420625 in words is "one billion, six hundred eleven million, four hundred twenty thousand, six hundred twenty-five".