51291729497 has 2 divisors, whose sum is σ = 51291729498. Its totient is φ = 51291729496.

The previous prime is 51291729479. The next prime is 51291729499. The reversal of 51291729497 is 79492719215.

It is a happy number.

Together with previous prime (51291729479) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44914748761 + 6376980736 = 211931^2 + 79856^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51291729497 is a prime.

Together with 51291729499, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51291729499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25645864748 + 25645864749.

It is an arithmetic number, because the mean of its divisors is an integer number (25645864749).

Almost surely, 2^51291729497 is an apocalyptic number.

It is an amenable number.

51291729497 is a deficient number, since it is larger than the sum of its proper divisors (1).

51291729497 is an equidigital number, since it uses as much as digits as its factorization.

51291729497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2857680, while the sum is 56.

The spelling of 51291729497 in words is "fifty-one billion, two hundred ninety-one million, seven hundred twenty-nine thousand, four hundred ninety-seven".