51371549 has 2 divisors, whose sum is σ = 51371550. Its totient is φ = 51371548.

The previous prime is 51371539. The next prime is 51371563. The reversal of 51371549 is 94517315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50310649 + 1060900 = 7093^2 + 1030^2 .

It is a cyclic number.

It is not a de Polignac number, because 51371549 - 2⁴ = 51371533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51371539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25685774 + 25685775.

It is an arithmetic number, because the mean of its divisors is an integer number (25685775).

Almost surely, 2^51371549 is an apocalyptic number.

It is an amenable number.

51371549 is a deficient number, since it is larger than the sum of its proper divisors (1).

51371549 is an equidigital number, since it uses as much as digits as its factorization.

51371549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18900, while the sum is 35.

The square root of 51371549 is about 7167.3948544782. The cubic root of 51371549 is about 371.7413630782.

The spelling of 51371549 in words is "fifty-one million, three hundred seventy-one thousand, five hundred forty-nine".