51374821 has 2 divisors, whose sum is σ = 51374822. Its totient is φ = 51374820.

The previous prime is 51374797. The next prime is 51374831. The reversal of 51374821 is 12847315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33005025 + 18369796 = 5745^2 + 4286^2 .

It is a cyclic number.

It is not a de Polignac number, because 51374821 - 2¹¹ = 51372773 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51374831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25687410 + 25687411.

It is an arithmetic number, because the mean of its divisors is an integer number (25687411).

Almost surely, 2^51374821 is an apocalyptic number.

It is an amenable number.

51374821 is a deficient number, since it is larger than the sum of its proper divisors (1).

51374821 is an equidigital number, since it uses as much as digits as its factorization.

51374821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 31.

The square root of 51374821 is about 7167.6231067209. The cubic root of 51374821 is about 371.7492553321.

The spelling of 51374821 in words is "fifty-one million, three hundred seventy-four thousand, eight hundred twenty-one".