51451217 has 2 divisors, whose sum is σ = 51451218. Its totient is φ = 51451216.

The previous prime is 51451159. The next prime is 51451219. The reversal of 51451217 is 71215415.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44943616 + 6507601 = 6704^2 + 2551^2 .

It is a cyclic number.

It is not a de Polignac number, because 51451217 - 2⁸ = 51450961 is a prime.

Together with 51451219, 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 (51451219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25725608 + 25725609.

It is an arithmetic number, because the mean of its divisors is an integer number (25725609).

Almost surely, 2^51451217 is an apocalyptic number.

It is an amenable number.

51451217 is a deficient number, since it is larger than the sum of its proper divisors (1).

51451217 is an equidigital number, since it uses as much as digits as its factorization.

51451217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1400, while the sum is 26.

The square root of 51451217 is about 7172.9503692693. The cubic root of 51451217 is about 371.9334317429.

The spelling of 51451217 in words is "fifty-one million, four hundred fifty-one thousand, two hundred seventeen".