51871790899 has 2 divisors, whose sum is σ = 51871790900. Its totient is φ = 51871790898.

The previous prime is 51871790869. The next prime is 51871790939. The reversal of 51871790899 is 99809717815.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51871790899 - 2¹¹ = 51871788851 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51871790899.

It is not a weakly prime, because it can be changed into another prime (51871790809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25935895449 + 25935895450.

It is an arithmetic number, because the mean of its divisors is an integer number (25935895450).

Almost surely, 2^51871790899 is an apocalyptic number.

51871790899 is a deficient number, since it is larger than the sum of its proper divisors (1).

51871790899 is an equidigital number, since it uses as much as digits as its factorization.

51871790899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11430720, while the sum is 64.

The spelling of 51871790899 in words is "fifty-one billion, eight hundred seventy-one million, seven hundred ninety thousand, eight hundred ninety-nine".