51864749 has 2 divisors, whose sum is σ = 51864750. Its totient is φ = 51864748.

The previous prime is 51864691. The next prime is 51864779. The reversal of 51864749 is 94746815.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34140649 + 17724100 = 5843^2 + 4210^2 .

It is a cyclic number.

It is not a de Polignac number, because 51864749 - 2¹⁶ = 51799213 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51864779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25932374 + 25932375.

It is an arithmetic number, because the mean of its divisors is an integer number (25932375).

Almost surely, 2^51864749 is an apocalyptic number.

It is an amenable number.

51864749 is a deficient number, since it is larger than the sum of its proper divisors (1).

51864749 is an equidigital number, since it uses as much as digits as its factorization.

51864749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 44.

The square root of 51864749 is about 7201.7184754751. The cubic root of 51864749 is about 372.9272283863.

The spelling of 51864749 in words is "fifty-one million, eight hundred sixty-four thousand, seven hundred forty-nine".