51671549 has 2 divisors, whose sum is σ = 51671550. Its totient is φ = 51671548.

The previous prime is 51671491. The next prime is 51671563. The reversal of 51671549 is 94517615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51222649 + 448900 = 7157^2 + 670^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51671549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51671149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25835774 + 25835775.

It is an arithmetic number, because the mean of its divisors is an integer number (25835775).

Almost surely, 2^51671549 is an apocalyptic number.

It is an amenable number.

51671549 is a deficient number, since it is larger than the sum of its proper divisors (1).

51671549 is an equidigital number, since it uses as much as digits as its factorization.

51671549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37800, while the sum is 38.

The square root of 51671549 is about 7188.2924954401. The cubic root of 51671549 is about 372.4635917751.

The spelling of 51671549 in words is "fifty-one million, six hundred seventy-one thousand, five hundred forty-nine".