51549372869 has 2 divisors, whose sum is σ = 51549372870. Its totient is φ = 51549372868.

The previous prime is 51549372851. The next prime is 51549372877. The reversal of 51549372869 is 96827394515.

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., 36637788100 + 14911584769 = 191410^2 + 122113^2 .

It is a cyclic number.

It is not a de Polignac number, because 51549372869 - 2²⁸ = 51280937413 is a prime.

It is a super-2 number, since 2×51549372869² (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 (51549378869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25774686434 + 25774686435.

It is an arithmetic number, because the mean of its divisors is an integer number (25774686435).

Almost surely, 2^51549372869 is an apocalyptic number.

It is an amenable number.

51549372869 is a deficient number, since it is larger than the sum of its proper divisors (1).

51549372869 is an equidigital number, since it uses as much as digits as its factorization.

51549372869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16329600, while the sum is 59.

The spelling of 51549372869 in words is "fifty-one billion, five hundred forty-nine million, three hundred seventy-two thousand, eight hundred sixty-nine".