47121995813 has 2 divisors, whose sum is σ = 47121995814. Its totient is φ = 47121995812.

The previous prime is 47121995797. The next prime is 47121995827. The reversal of 47121995813 is 31859912174.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46601152129 + 520843684 = 215873^2 + 22822^2 .

It is a cyclic number.

It is not a de Polignac number, because 47121995813 - 2⁴ = 47121995797 is a prime.

It is a Sophie Germain 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 (47121995863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23560997906 + 23560997907.

It is an arithmetic number, because the mean of its divisors is an integer number (23560997907).

Almost surely, 2^47121995813 is an apocalyptic number.

It is an amenable number.

47121995813 is a deficient number, since it is larger than the sum of its proper divisors (1).

47121995813 is an equidigital number, since it uses as much as digits as its factorization.

47121995813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 50.

The spelling of 47121995813 in words is "forty-seven billion, one hundred twenty-one million, nine hundred ninety-five thousand, eight hundred thirteen".