51249449 has 4 divisors (see below), whose sum is σ = 51273600. Its totient is φ = 51225300.

The previous prime is 51249391. The next prime is 51249503. The reversal of 51249449 is 94494215.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94494215 = 5 ⋅18898843.

It is a cyclic number.

It is not a de Polignac number, because 51249449 - 2⁸ = 51249193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51249349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8549 + ... + 13250.

It is an arithmetic number, because the mean of its divisors is an integer number (12818400).

Almost surely, 2^51249449 is an apocalyptic number.

It is an amenable number.

51249449 is a deficient number, since it is larger than the sum of its proper divisors (24151).

51249449 is a wasteful number, since it uses less digits than its factorization.

51249449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24150.

The product of its digits is 51840, while the sum is 38.

The square root of 51249449 is about 7158.8720480254. The cubic root of 51249449 is about 371.4466108948.

The spelling of 51249449 in words is "fifty-one million, two hundred forty-nine thousand, four hundred forty-nine".