51249843 has 6 divisors (see below), whose sum is σ = 74027564. Its totient is φ = 34166556.

The previous prime is 51249839. The next prime is 51249857. The reversal of 51249843 is 34894215.

It is not a de Polignac number, because 51249843 - 2² = 51249839 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51249798 and 51249807.

It is not an unprimeable number, because it can be changed into a prime (51249823) 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 in 5 ways as a sum of consecutive naturals, for example, 2847205 + ... + 2847222.

Almost surely, 2^51249843 is an apocalyptic number.

51249843 is a deficient number, since it is larger than the sum of its proper divisors (22777721).

51249843 is a wasteful number, since it uses less digits than its factorization.

51249843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5694433 (or 5694430 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 51249843 is about 7158.8995662741. The cubic root of 51249843 is about 371.4475627723.

The spelling of 51249843 in words is "fifty-one million, two hundred forty-nine thousand, eight hundred forty-three".