51643771 has 2 divisors, whose sum is σ = 51643772. Its totient is φ = 51643770.

The previous prime is 51643769. The next prime is 51643793. The reversal of 51643771 is 17734615.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51643771 - 2¹ = 51643769 is a prime.

Together with 51643769, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51643721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25821885 + 25821886.

It is an arithmetic number, because the mean of its divisors is an integer number (25821886).

Almost surely, 2^51643771 is an apocalyptic number.

51643771 is a deficient number, since it is larger than the sum of its proper divisors (1).

51643771 is an equidigital number, since it uses as much as digits as its factorization.

51643771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17640, while the sum is 34.

The square root of 51643771 is about 7186.3600661253. The cubic root of 51643771 is about 372.3968358368.

The spelling of 51643771 in words is "fifty-one million, six hundred forty-three thousand, seven hundred seventy-one".