11947431101 has 2 divisors, whose sum is σ = 11947431102. Its totient is φ = 11947431100.

The previous prime is 11947431061. The next prime is 11947431103. The reversal of 11947431101 is 10113474911.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11946708601 + 722500 = 109301^2 + 850^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11947431101 is a prime.

It is a super-2 number, since 2×11947431101² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 11947431103, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11947431103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5973715550 + 5973715551.

It is an arithmetic number, because the mean of its divisors is an integer number (5973715551).

Almost surely, 2^11947431101 is an apocalyptic number.

It is an amenable number.

11947431101 is a deficient number, since it is larger than the sum of its proper divisors (1).

11947431101 is an equidigital number, since it uses as much as digits as its factorization.

11947431101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 32.

The spelling of 11947431101 in words is "eleven billion, nine hundred forty-seven million, four hundred thirty-one thousand, one hundred one".