11311212625 has 16 divisors (see below), whose sum is σ = 14119749072. Its totient is φ = 9046819200.

The previous prime is 11311212617. The next prime is 11311212629. The reversal of 11311212625 is 52621211311.

It can be written as a sum of positive squares in 8 ways, for example, as 7031828736 + 4279383889 = 83856^2 + 65417^2 .

It is not a de Polignac number, because 11311212625 - 2³ = 11311212617 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

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 11311212625.

It is not an unprimeable number, because it can be changed into a prime (11311212629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 709239 + ... + 725011.

It is an arithmetic number, because the mean of its divisors is an integer number (882484317).

Almost surely, 2^11311212625 is an apocalyptic number.

It is an amenable number.

11311212625 is a deficient number, since it is larger than the sum of its proper divisors (2808536447).

11311212625 is an equidigital number, since it uses as much as digits as its factorization.

11311212625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21525 (or 21515 counting only the distinct ones).

The product of its digits is 720, while the sum is 25.

Adding to 11311212625 its reverse (52621211311), we get a palindrome (63932423936).

The spelling of 11311212625 in words is "eleven billion, three hundred eleven million, two hundred twelve thousand, six hundred twenty-five".