2051918993 has 2 divisors, whose sum is σ = 2051918994. Its totient is φ = 2051918992.

The previous prime is 2051918971. The next prime is 2051919011. The reversal of 2051918993 is 3998191502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1100381584 + 951537409 = 33172^2 + 30847^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2051918993 is a prime.

It is not a weakly prime, because it can be changed into another prime (2051918093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1025959496 + 1025959497.

It is an arithmetic number, because the mean of its divisors is an integer number (1025959497).

Almost surely, 2^2051918993 is an apocalyptic number.

It is an amenable number.

2051918993 is a deficient number, since it is larger than the sum of its proper divisors (1).

2051918993 is an equidigital number, since it uses as much as digits as its factorization.

2051918993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 174960, while the sum is 47.

The square root of 2051918993 is about 45298.1124661944. The cubic root of 2051918993 is about 1270.7303532552.

The spelling of 2051918993 in words is "two billion, fifty-one million, nine hundred eighteen thousand, nine hundred ninety-three".