51042402 has 12 divisors (see below), whose sum is σ = 110591910. Its totient is φ = 17014128.

The previous prime is 51042373. The next prime is 51042457. The reversal of 51042402 is 20424015.

It can be written as a sum of positive squares in only one way, i.e., 33977241 + 17065161 = 5829^2 + 4131^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 2835689 = 51042402 / (5 + 1 + 0 + 4 + 2 + 4 + 0 + 2).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1417827 + ... + 1417862.

Almost surely, 2^51042402 is an apocalyptic number.

51042402 is an abundant number, since it is smaller than the sum of its proper divisors (59549508).

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

51042402 is a wasteful number, since it uses less digits than its factorization.

51042402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2835697 (or 2835694 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 51042402 is about 7144.3965455453. The cubic root of 51042402 is about 370.9457228618.

Adding to 51042402 its reverse (20424015), we get a palindrome (71466417).

The spelling of 51042402 in words is "fifty-one million, forty-two thousand, four hundred two".