2129749813 has 2 divisors, whose sum is σ = 2129749814. Its totient is φ = 2129749812.

The previous prime is 2129749771. The next prime is 2129749819. The reversal of 2129749813 is 3189479212.

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., 2088764209 + 40985604 = 45703^2 + 6402^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2129749813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2129749819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1064874906 + 1064874907.

It is an arithmetic number, because the mean of its divisors is an integer number (1064874907).

Almost surely, 2^2129749813 is an apocalyptic number.

It is an amenable number.

2129749813 is a deficient number, since it is larger than the sum of its proper divisors (1).

2129749813 is an equidigital number, since it uses as much as digits as its factorization.

2129749813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 46.

The square root of 2129749813 is about 46149.2124851552. The cubic root of 2129749813 is about 1286.5979732433.

The spelling of 2129749813 in words is "two billion, one hundred twenty-nine million, seven hundred forty-nine thousand, eight hundred thirteen".