51084721 has 2 divisors, whose sum is σ = 51084722. Its totient is φ = 51084720.

The previous prime is 51084707. The next prime is 51084727. The reversal of 51084721 is 12748015.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50566321 + 518400 = 7111^2 + 720^2 .

It is a cyclic number.

It is not a de Polignac number, because 51084721 - 2¹¹ = 51082673 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51084721.

It is not a weakly prime, because it can be changed into another prime (51084727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25542360 + 25542361.

It is an arithmetic number, because the mean of its divisors is an integer number (25542361).

Almost surely, 2^51084721 is an apocalyptic number.

It is an amenable number.

51084721 is a deficient number, since it is larger than the sum of its proper divisors (1).

51084721 is an equidigital number, since it uses as much as digits as its factorization.

51084721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 51084721 is about 7147.3576236257. The cubic root of 51084721 is about 371.0482109569.

The spelling of 51084721 in words is "fifty-one million, eighty-four thousand, seven hundred twenty-one".