11961113513 has 2 divisors, whose sum is σ = 11961113514. Its totient is φ = 11961113512.

The previous prime is 11961113401. The next prime is 11961113537. The reversal of 11961113513 is 31531116911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11889067369 + 72046144 = 109037^2 + 8488^2 .

It is a cyclic number.

It is not a de Polignac number, because 11961113513 - 2³⁰ = 10887371689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11961113513.

It is not a weakly prime, because it can be changed into another prime (11961103513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5980556756 + 5980556757.

It is an arithmetic number, because the mean of its divisors is an integer number (5980556757).

Almost surely, 2^11961113513 is an apocalyptic number.

It is an amenable number.

11961113513 is a deficient number, since it is larger than the sum of its proper divisors (1).

11961113513 is an equidigital number, since it uses as much as digits as its factorization.

11961113513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2430, while the sum is 32.

The spelling of 11961113513 in words is "eleven billion, nine hundred sixty-one million, one hundred thirteen thousand, five hundred thirteen".