51447449 has 2 divisors, whose sum is σ = 51447450. Its totient is φ = 51447448.

The previous prime is 51447443. The next prime is 51447493. The reversal of 51447449 is 94474415.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51337225 + 110224 = 7165^2 + 332^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51447449 is a prime.

It is not a weakly prime, because it can be changed into another prime (51447443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25723724 + 25723725.

It is an arithmetic number, because the mean of its divisors is an integer number (25723725).

Almost surely, 2^51447449 is an apocalyptic number.

It is an amenable number.

51447449 is a deficient number, since it is larger than the sum of its proper divisors (1).

51447449 is an equidigital number, since it uses as much as digits as its factorization.

51447449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 38.

The square root of 51447449 is about 7172.6877110327. The cubic root of 51447449 is about 371.9243520783.

The spelling of 51447449 in words is "fifty-one million, four hundred forty-seven thousand, four hundred forty-nine".