51947851 has 2 divisors, whose sum is σ = 51947852. Its totient is φ = 51947850.

The previous prime is 51947849. The next prime is 51947873. The reversal of 51947851 is 15874915.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51947851 - 2¹ = 51947849 is a prime.

Together with 51947849, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51947821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25973925 + 25973926.

It is an arithmetic number, because the mean of its divisors is an integer number (25973926).

Almost surely, 2^51947851 is an apocalyptic number.

51947851 is a deficient number, since it is larger than the sum of its proper divisors (1).

51947851 is an equidigital number, since it uses as much as digits as its factorization.

51947851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 40.

The square root of 51947851 is about 7207.4857613456. The cubic root of 51947851 is about 373.1263004069.

The spelling of 51947851 in words is "fifty-one million, nine hundred forty-seven thousand, eight hundred fifty-one".