51849881 has 4 divisors (see below), whose sum is σ = 54899892. Its totient is φ = 48799872.

The previous prime is 51849877. The next prime is 51849899. The reversal of 51849881 is 18894815.

51849881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18894815 = 5 ⋅3778963.

It can be written as a sum of positive squares in 2 ways, for example, as 44342281 + 7507600 = 6659^2 + 2740^2 .

It is a cyclic number.

It is not a de Polignac number, because 51849881 - 2² = 51849877 is a prime.

It is a super-2 number, since 2×51849881² = 5376820319428322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51849181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1524980 + ... + 1525013.

It is an arithmetic number, because the mean of its divisors is an integer number (13724973).

Almost surely, 2^51849881 is an apocalyptic number.

It is an amenable number.

51849881 is a deficient number, since it is larger than the sum of its proper divisors (3050011).

51849881 is a wasteful number, since it uses less digits than its factorization.

51849881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3050010.

The product of its digits is 92160, while the sum is 44.

The square root of 51849881 is about 7200.6861478612. The cubic root of 51849881 is about 372.8915894598.

The spelling of 51849881 in words is "fifty-one million, eight hundred forty-nine thousand, eight hundred eighty-one".