51200642 has 4 divisors (see below), whose sum is σ = 76800966. Its totient is φ = 25600320.

The previous prime is 51200621. The next prime is 51200647. The reversal of 51200642 is 24600215.

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., 49970761 + 1229881 = 7069^2 + 1109^2 .

It is not an unprimeable number, because it can be changed into a prime (51200647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12800159 + ... + 12800162.

Almost surely, 2^51200642 is an apocalyptic number.

51200642 is a deficient number, since it is larger than the sum of its proper divisors (25600324).

51200642 is a wasteful number, since it uses less digits than its factorization.

51200642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25600323.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 51200642 is about 7155.4623889725. The cubic root of 51200642 is about 371.3286587138.

Adding to 51200642 its reverse (24600215), we get a palindrome (75800857).

The spelling of 51200642 in words is "fifty-one million, two hundred thousand, six hundred forty-two".