51000109999 has 2 divisors, whose sum is σ = 51000110000. Its totient is φ = 51000109998.

The previous prime is 51000109969. The next prime is 51000110033. The reversal of 51000109999 is 99990100015.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51000109999 - 2²¹ = 50998012847 is a prime.

It is a super-2 number, since 2×51000109999² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51000109969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25500054999 + 25500055000.

It is an arithmetic number, because the mean of its divisors is an integer number (25500055000).

Almost surely, 2^51000109999 is an apocalyptic number.

51000109999 is a deficient number, since it is larger than the sum of its proper divisors (1).

51000109999 is an equidigital number, since it uses as much as digits as its factorization.

51000109999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32805, while the sum is 43.

The spelling of 51000109999 in words is "fifty-one billion, one hundred nine thousand, nine hundred ninety-nine".