51409449 has 48 divisors (see below), whose sum is σ = 93684864. Its totient is φ = 26438400.

The previous prime is 51409441. The next prime is 51409451. The reversal of 51409449 is 94490415.

It is a happy number.

It is not a de Polignac number, because 51409449 - 2³ = 51409441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51409441) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 32814 + ... + 34344.

It is an arithmetic number, because the mean of its divisors is an integer number (1951768).

Almost surely, 2^51409449 is an apocalyptic number.

It is an amenable number.

51409449 is a deficient number, since it is larger than the sum of its proper divisors (42275415).

51409449 is a wasteful number, since it uses less digits than its factorization.

51409449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1598 (or 1595 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 51409449 is about 7170.0382844166. The cubic root of 51409449 is about 371.8327595456.

The spelling of 51409449 in words is "fifty-one million, four hundred nine thousand, four hundred forty-nine".