51374021 has 2 divisors, whose sum is σ = 51374022. Its totient is φ = 51374020.

The previous prime is 51374003. The next prime is 51374027. The reversal of 51374021 is 12047315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31024900 + 20349121 = 5570^2 + 4511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51374021 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 (51374027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25687010 + 25687011.

It is an arithmetic number, because the mean of its divisors is an integer number (25687011).

Almost surely, 2^51374021 is an apocalyptic number.

It is an amenable number.

51374021 is a deficient number, since it is larger than the sum of its proper divisors (1).

51374021 is an equidigital number, since it uses as much as digits as its factorization.

51374021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 51374021 is about 7167.5672999980. The cubic root of 51374021 is about 371.7473257166.

The spelling of 51374021 in words is "fifty-one million, three hundred seventy-four thousand, twenty-one".