51291729499 has 2 divisors, whose sum is σ = 51291729500. Its totient is φ = 51291729498.

The previous prime is 51291729497. The next prime is 51291729539. The reversal of 51291729499 is 99492719215.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51291729499 - 2¹ = 51291729497 is a prime.

Together with 51291729497, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51291729497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25645864749 + 25645864750.

It is an arithmetic number, because the mean of its divisors is an integer number (25645864750).

Almost surely, 2^51291729499 is an apocalyptic number.

51291729499 is a deficient number, since it is larger than the sum of its proper divisors (1).

51291729499 is an equidigital number, since it uses as much as digits as its factorization.

51291729499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3674160, while the sum is 58.

The spelling of 51291729499 in words is "fifty-one billion, two hundred ninety-one million, seven hundred twenty-nine thousand, four hundred ninety-nine".