51494920 has 16 divisors (see below), whose sum is σ = 115863660. Its totient is φ = 20597952.

The previous prime is 51494917. The next prime is 51494957. The reversal of 51494920 is 2949415.

It can be written as a sum of positive squares in 2 ways, for example, as 49871844 + 1623076 = 7062^2 + 1274^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 643647 + ... + 643726.

Almost surely, 2^51494920 is an apocalyptic number.

It is an amenable number.

51494920 is an abundant number, since it is smaller than the sum of its proper divisors (64368740).

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

51494920 is a wasteful number, since it uses less digits than its factorization.

51494920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1287384 (or 1287380 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 51494920 is about 7175.9960981037. The cubic root of 51494920 is about 372.0387095033.

The spelling of 51494920 in words is "fifty-one million, four hundred ninety-four thousand, nine hundred twenty".