51977647 has 2 divisors, whose sum is σ = 51977648. Its totient is φ = 51977646.

The previous prime is 51977641. The next prime is 51977659. The reversal of 51977647 is 74677915.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51977647 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 51977597 and 51977606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51977641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25988823 + 25988824.

It is an arithmetic number, because the mean of its divisors is an integer number (25988824).

Almost surely, 2^51977647 is an apocalyptic number.

51977647 is a deficient number, since it is larger than the sum of its proper divisors (1).

51977647 is an equidigital number, since it uses as much as digits as its factorization.

51977647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 370440, while the sum is 46.

The square root of 51977647 is about 7209.5524826441. The cubic root of 51977647 is about 373.1976254383.

The spelling of 51977647 in words is "fifty-one million, nine hundred seventy-seven thousand, six hundred forty-seven".