51423121487 has 2 divisors, whose sum is σ = 51423121488. Its totient is φ = 51423121486.

The previous prime is 51423121429. The next prime is 51423121583. The reversal of 51423121487 is 78412132415.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51423121487 is a prime.

It is a super-2 number, since 2×51423121487² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51423121487.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51423121417) 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, 25711560743 + 25711560744.

It is an arithmetic number, because the mean of its divisors is an integer number (25711560744).

Almost surely, 2^51423121487 is an apocalyptic number.

51423121487 is a deficient number, since it is larger than the sum of its proper divisors (1).

51423121487 is an equidigital number, since it uses as much as digits as its factorization.

51423121487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 53760, while the sum is 38.

The spelling of 51423121487 in words is "fifty-one billion, four hundred twenty-three million, one hundred twenty-one thousand, four hundred eighty-seven".