11925172513 has 4 divisors (see below), whose sum is σ = 11925889348. Its totient is φ = 11924455680.

The previous prime is 11925172489. The next prime is 11925172537. The reversal of 11925172513 is 31527152911.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (11925172489) and next prime (11925172537).

It can be written as a sum of positive squares in 2 ways, for example, as 11148825744 + 776346769 = 105588^2 + 27863^2 .

It is a cyclic number.

It is not a de Polignac number, because 11925172513 - 2⁹ = 11925172001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11925172813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 332856 + ... + 366937.

It is an arithmetic number, because the mean of its divisors is an integer number (2981472337).

Almost surely, 2^11925172513 is an apocalyptic number.

It is an amenable number.

11925172513 is a deficient number, since it is larger than the sum of its proper divisors (716835).

11925172513 is an equidigital number, since it uses as much as digits as its factorization.

11925172513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716834.

The product of its digits is 18900, while the sum is 37.

The spelling of 11925172513 in words is "eleven billion, nine hundred twenty-five million, one hundred seventy-two thousand, five hundred thirteen".