51834721 has 2 divisors, whose sum is σ = 51834722. Its totient is φ = 51834720.

The previous prime is 51834703. The next prime is 51834767. The reversal of 51834721 is 12743815.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45900625 + 5934096 = 6775^2 + 2436^2 .

It is a cyclic number.

It is not a de Polignac number, because 51834721 - 2¹⁹ = 51310433 is a prime.

It is a super-2 number, since 2×51834721² = 5373676602295682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51834781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25917360 + 25917361.

It is an arithmetic number, because the mean of its divisors is an integer number (25917361).

Almost surely, 2^51834721 is an apocalyptic number.

It is an amenable number.

51834721 is a deficient number, since it is larger than the sum of its proper divisors (1).

51834721 is an equidigital number, since it uses as much as digits as its factorization.

51834721 is an odious number, because the sum of its binary digits is odd.

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

The square root of 51834721 is about 7199.6333934444. The cubic root of 51834721 is about 372.8552435870.

The spelling of 51834721 in words is "fifty-one million, eight hundred thirty-four thousand, seven hundred twenty-one".