51643351 has 2 divisors, whose sum is σ = 51643352. Its totient is φ = 51643350.

The previous prime is 51643343. The next prime is 51643367. The reversal of 51643351 is 15334615.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51643351 - 2³ = 51643343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51643321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25821675 + 25821676.

It is an arithmetic number, because the mean of its divisors is an integer number (25821676).

Almost surely, 2^51643351 is an apocalyptic number.

51643351 is a deficient number, since it is larger than the sum of its proper divisors (1).

51643351 is an equidigital number, since it uses as much as digits as its factorization.

51643351 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 28.

The square root of 51643351 is about 7186.3308440400. The cubic root of 51643351 is about 372.3958263114.

Adding to 51643351 its reverse (15334615), we get a palindrome (66977966).

It can be divided in two parts, 5164 and 3351, that added together give a triangular number (8515 = T₁₃₀).

The spelling of 51643351 in words is "fifty-one million, six hundred forty-three thousand, three hundred fifty-one".