51142930 has 8 divisors (see below), whose sum is σ = 92057292. Its totient is φ = 20457168.

The previous prime is 51142913. The next prime is 51142937. The reversal of 51142930 is 3924115.

It can be written as a sum of positive squares in 2 ways, for example, as 47210641 + 3932289 = 6871^2 + 1983^2 .

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 = 51142895 and 51142904.

It is not an unprimeable number, because it can be changed into a prime (51142937) 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, 2557137 + ... + 2557156.

Almost surely, 2^51142930 is an apocalyptic number.

51142930 is a deficient number, since it is larger than the sum of its proper divisors (40914362).

51142930 is a wasteful number, since it uses less digits than its factorization.

51142930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5114300.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 51142930 is about 7151.4285286228. The cubic root of 51142930 is about 371.1890890028.

The spelling of 51142930 in words is "fifty-one million, one hundred forty-two thousand, nine hundred thirty".