51515671 has 2 divisors, whose sum is σ = 51515672. Its totient is φ = 51515670.

The previous prime is 51515657. The next prime is 51515719. The reversal of 51515671 is 17651515.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51515671 - 2⁹ = 51515159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51515621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25757835 + 25757836.

It is an arithmetic number, because the mean of its divisors is an integer number (25757836).

Almost surely, 2^51515671 is an apocalyptic number.

51515671 is a deficient number, since it is larger than the sum of its proper divisors (1).

51515671 is an equidigital number, since it uses as much as digits as its factorization.

51515671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5250, while the sum is 31.

The square root of 51515671 is about 7177.4418144629. The cubic root of 51515671 is about 372.0886764935.

The spelling of 51515671 in words is "fifty-one million, five hundred fifteen thousand, six hundred seventy-one".