51421229 has 2 divisors, whose sum is σ = 51421230. Its totient is φ = 51421228.

The previous prime is 51421217. The next prime is 51421259. The reversal of 51421229 is 92212415.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48972004 + 2449225 = 6998^2 + 1565^2 .

It is a cyclic number.

It is not a de Polignac number, because 51421229 - 2⁴ = 51421213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51421198 and 51421207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51421259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25710614 + 25710615.

It is an arithmetic number, because the mean of its divisors is an integer number (25710615).

Almost surely, 2^51421229 is an apocalyptic number.

It is an amenable number.

51421229 is a deficient number, since it is larger than the sum of its proper divisors (1).

51421229 is an equidigital number, since it uses as much as digits as its factorization.

51421229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 26.

The square root of 51421229 is about 7170.8597113596. The cubic root of 51421229 is about 371.8611580564.

The spelling of 51421229 in words is "fifty-one million, four hundred twenty-one thousand, two hundred twenty-nine".