51423242 has 8 divisors (see below), whose sum is σ = 83068356. Its totient is φ = 23733792.

The previous prime is 51423209. The next prime is 51423247. The reversal of 51423242 is 24232415.

It is a happy number.

It is a Cunningham number, because it is equal to 7171²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 51423241 + 1 = 7171^2 + 1^2 .

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

It is not an unprimeable number, because it can be changed into a prime (51423247) 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, 988883 + ... + 988934.

Almost surely, 2^51423242 is an apocalyptic number.

51423242 is a deficient number, since it is larger than the sum of its proper divisors (31645114).

51423242 is a wasteful number, since it uses less digits than its factorization.

51423242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1977832.

The product of its digits is 1920, while the sum is 23.

The square root of 51423242 is about 7171.0000697253. Note that the first 4 decimals coincide. The cubic root of 51423242 is about 371.8660104411.

Adding to 51423242 its reverse (24232415), we get a palindrome (75655657).

The spelling of 51423242 in words is "fifty-one million, four hundred twenty-three thousand, two hundred forty-two".