51949818 has 24 divisors (see below), whose sum is σ = 112986900. Its totient is φ = 17250624.

The previous prime is 51949811. The next prime is 51949823. The reversal of 51949818 is 81894915.

51949818 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 51022449 + 927369 = 7143^2 + 963^2 .

It is not an unprimeable number, because it can be changed into a prime (51949811) 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 11 ways as a sum of consecutive naturals, for example, 523 + ... + 10206.

Almost surely, 2^51949818 is an apocalyptic number.

51949818 is an abundant number, since it is smaller than the sum of its proper divisors (61037082).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51949818 is a wasteful number, since it uses less digits than its factorization.

51949818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11006 (or 11003 counting only the distinct ones).

The product of its digits is 103680, while the sum is 45.

The square root of 51949818 is about 7207.6222154050. The cubic root of 51949818 is about 373.1310098104.

The spelling of 51949818 in words is "fifty-one million, nine hundred forty-nine thousand, eight hundred eighteen".