51424402 has 4 divisors (see below), whose sum is σ = 77136606. Its totient is φ = 25712200.

The previous prime is 51424397. The next prime is 51424411. The reversal of 51424402 is 20442415.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 44502241 + 6922161 = 6671^2 + 2631^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12856099 + ... + 12856102.

Almost surely, 2^51424402 is an apocalyptic number.

51424402 is a deficient number, since it is larger than the sum of its proper divisors (25712204).

51424402 is a wasteful number, since it uses less digits than its factorization.

51424402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25712203.

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 51424402 is about 7171.0809505959. The cubic root of 51424402 is about 371.8688065913.

Adding to 51424402 its reverse (20442415), we get a palindrome (71866817).

The spelling of 51424402 in words is "fifty-one million, four hundred twenty-four thousand, four hundred two".