51515421071 has 2 divisors, whose sum is σ = 51515421072. Its totient is φ = 51515421070.

The previous prime is 51515421047. The next prime is 51515421073. The reversal of 51515421071 is 17012451515.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51515421071 is a prime.

Together with 51515421073, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51515421073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25757710535 + 25757710536.

It is an arithmetic number, because the mean of its divisors is an integer number (25757710536).

Almost surely, 2^51515421071 is an apocalyptic number.

51515421071 is a deficient number, since it is larger than the sum of its proper divisors (1).

51515421071 is an equidigital number, since it uses as much as digits as its factorization.

51515421071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7000, while the sum is 32.

Adding to 51515421071 its reverse (17012451515), we get a palindrome (68527872586).

The spelling of 51515421071 in words is "fifty-one billion, five hundred fifteen million, four hundred twenty-one thousand, seventy-one".