51871790869 has 2 divisors, whose sum is σ = 51871790870. Its totient is φ = 51871790868.

The previous prime is 51871790857. The next prime is 51871790899. The reversal of 51871790869 is 96809717815.

51871790869 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37546812900 + 14324977969 = 193770^2 + 119687^2 .

It is a cyclic number.

It is not a de Polignac number, because 51871790869 - 2⁹ = 51871790357 is a prime.

It is a super-2 number, since 2×51871790869² (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 (51871790809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25935895434 + 25935895435.

It is an arithmetic number, because the mean of its divisors is an integer number (25935895435).

Almost surely, 2^51871790869 is an apocalyptic number.

It is an amenable number.

51871790869 is a deficient number, since it is larger than the sum of its proper divisors (1).

51871790869 is an equidigital number, since it uses as much as digits as its factorization.

51871790869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7620480, while the sum is 61.

The spelling of 51871790869 in words is "fifty-one billion, eight hundred seventy-one million, seven hundred ninety thousand, eight hundred sixty-nine".