51881729 has 2 divisors, whose sum is σ = 51881730. Its totient is φ = 51881728.

The previous prime is 51881717. The next prime is 51881737. The reversal of 51881729 is 92718815.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28601104 + 23280625 = 5348^2 + 4825^2 .

It is a cyclic number.

It is not a de Polignac number, because 51881729 - 2²⁴ = 35104513 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (51581729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25940864 + 25940865.

It is an arithmetic number, because the mean of its divisors is an integer number (25940865).

Almost surely, 2^51881729 is an apocalyptic number.

It is an amenable number.

51881729 is a deficient number, since it is larger than the sum of its proper divisors (1).

51881729 is an equidigital number, since it uses as much as digits as its factorization.

51881729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 41.

The square root of 51881729 is about 7202.8972642958. The cubic root of 51881729 is about 372.9679214938.

The spelling of 51881729 in words is "fifty-one million, eight hundred eighty-one thousand, seven hundred twenty-nine".