51821743 has 2 divisors, whose sum is σ = 51821744. Its totient is φ = 51821742.

The previous prime is 51821723. The next prime is 51821747. The reversal of 51821743 is 34712815.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51821743 - 2²⁵ = 18267311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51821747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25910871 + 25910872.

It is an arithmetic number, because the mean of its divisors is an integer number (25910872).

Almost surely, 2^51821743 is an apocalyptic number.

51821743 is a deficient number, since it is larger than the sum of its proper divisors (1).

51821743 is an equidigital number, since it uses as much as digits as its factorization.

51821743 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 31.

The square root of 51821743 is about 7198.7320411306. The cubic root of 51821743 is about 372.8241233960.

The spelling of 51821743 in words is "fifty-one million, eight hundred twenty-one thousand, seven hundred forty-three".