51428449 has 2 divisors, whose sum is σ = 51428450. Its totient is φ = 51428448.

The previous prime is 51428441. The next prime is 51428477. The reversal of 51428449 is 94482415.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47018449 + 4410000 = 6857^2 + 2100^2 .

It is a cyclic number.

It is not a de Polignac number, because 51428449 - 2³ = 51428441 is a prime.

It is not a weakly prime, because it can be changed into another prime (51428441) 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, 25714224 + 25714225.

It is an arithmetic number, because the mean of its divisors is an integer number (25714225).

Almost surely, 2^51428449 is an apocalyptic number.

It is an amenable number.

51428449 is a deficient number, since it is larger than the sum of its proper divisors (1).

51428449 is an equidigital number, since it uses as much as digits as its factorization.

51428449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46080, while the sum is 37.

The square root of 51428449 is about 7171.3631200770. The cubic root of 51428449 is about 371.8785614517.

The spelling of 51428449 in words is "fifty-one million, four hundred twenty-eight thousand, four hundred forty-nine".