51049930 has 8 divisors (see below), whose sum is σ = 91889892. Its totient is φ = 20419968.

The previous prime is 51049919. The next prime is 51049931. The reversal of 51049930 is 3994015.

It can be written as a sum of positive squares in 2 ways, for example, as 48149721 + 2900209 = 6939^2 + 1703^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 51049892 and 51049901.

It is not an unprimeable number, because it can be changed into a prime (51049931) 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, 2552487 + ... + 2552506.

Almost surely, 2^51049930 is an apocalyptic number.

51049930 is a deficient number, since it is larger than the sum of its proper divisors (40839962).

51049930 is a wasteful number, since it uses less digits than its factorization.

51049930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5105000.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 51049930 is about 7144.9233725772. The cubic root of 51049930 is about 370.9639583028.

The spelling of 51049930 in words is "fifty-one million, forty-nine thousand, nine hundred thirty".