51663847 has 2 divisors, whose sum is σ = 51663848. Its totient is φ = 51663846.

The previous prime is 51663791. The next prime is 51663851. The reversal of 51663847 is 74836615.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51663847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51663047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25831923 + 25831924.

It is an arithmetic number, because the mean of its divisors is an integer number (25831924).

Almost surely, 2^51663847 is an apocalyptic number.

51663847 is a deficient number, since it is larger than the sum of its proper divisors (1).

51663847 is an equidigital number, since it uses as much as digits as its factorization.

51663847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 40.

The square root of 51663847 is about 7187.7567432406. The cubic root of 51663847 is about 372.4450847683.

The spelling of 51663847 in words is "fifty-one million, six hundred sixty-three thousand, eight hundred forty-seven".