51643607 has 2 divisors, whose sum is σ = 51643608. Its totient is φ = 51643606.

The previous prime is 51643597. The next prime is 51643609. The reversal of 51643607 is 70634615.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51643607 - 2⁸ = 51643351 is a prime.

Together with 51643609, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51643609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25821803 + 25821804.

It is an arithmetic number, because the mean of its divisors is an integer number (25821804).

Almost surely, 2^51643607 is an apocalyptic number.

51643607 is a deficient number, since it is larger than the sum of its proper divisors (1).

51643607 is an equidigital number, since it uses as much as digits as its factorization.

51643607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 51643607 is about 7186.3486556109. The cubic root of 51643607 is about 372.3964416418.

The spelling of 51643607 in words is "fifty-one million, six hundred forty-three thousand, six hundred seven".