1311918125 has 40 divisors (see below), whose sum is σ = 1883247168. Its totient is φ = 894960000.

The previous prime is 1311918103. The next prime is 1311918163. The reversal of 1311918125 is 5218191131.

It is a happy number.

It is not a de Polignac number, because 1311918125 - 2⁸ = 1311917869 is a prime.

It is a super-2 number, since 2×1311918125² = 3442258333407031250, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1311918091 and 1311918100.

It is a congruent number.

It is an unprimeable number.

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 in 39 ways as a sum of consecutive naturals, for example, 992465 + ... + 993785.

Almost surely, 2^1311918125 is an apocalyptic number.

It is an amenable number.

1311918125 is a deficient number, since it is larger than the sum of its proper divisors (571329043).

1311918125 is an equidigital number, since it uses as much as digits as its factorization.

1311918125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1575 (or 1560 counting only the distinct ones).

The product of its digits is 2160, while the sum is 32.

The square root of 1311918125 is about 36220.4103372670. The cubic root of 1311918125 is about 1094.7179621542.

The spelling of 1311918125 in words is "one billion, three hundred eleven million, nine hundred eighteen thousand, one hundred twenty-five".