51175121 has 2 divisors, whose sum is σ = 51175122. Its totient is φ = 51175120.

The previous prime is 51175109. The next prime is 51175123. The reversal of 51175121 is 12157115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38925121 + 12250000 = 6239^2 + 3500^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51175121 is a prime.

Together with 51175123, 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 (51175123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25587560 + 25587561.

It is an arithmetic number, because the mean of its divisors is an integer number (25587561).

Almost surely, 2^51175121 is an apocalyptic number.

It is an amenable number.

51175121 is a deficient number, since it is larger than the sum of its proper divisors (1).

51175121 is an equidigital number, since it uses as much as digits as its factorization.

51175121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 350, while the sum is 23.

The square root of 51175121 is about 7153.6788437838. The cubic root of 51175121 is about 371.2669521068.

The spelling of 51175121 in words is "fifty-one million, one hundred seventy-five thousand, one hundred twenty-one".