51984421 has 2 divisors, whose sum is σ = 51984422. Its totient is φ = 51984420.

The previous prime is 51984367. The next prime is 51984431. The reversal of 51984421 is 12448915.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39125025 + 12859396 = 6255^2 + 3586^2 .

It is a cyclic number.

It is not a de Polignac number, because 51984421 - 2⁷ = 51984293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51984431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25992210 + 25992211.

It is an arithmetic number, because the mean of its divisors is an integer number (25992211).

Almost surely, 2^51984421 is an apocalyptic number.

It is an amenable number.

51984421 is a deficient number, since it is larger than the sum of its proper divisors (1).

51984421 is an equidigital number, since it uses as much as digits as its factorization.

51984421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 34.

The square root of 51984421 is about 7210.0222607146. The cubic root of 51984421 is about 373.2138370924.

The spelling of 51984421 in words is "fifty-one million, nine hundred eighty-four thousand, four hundred twenty-one".