51040642 has 4 divisors (see below), whose sum is σ = 76560966. Its totient is φ = 25520320.

The previous prime is 51040607. The next prime is 51040727. The reversal of 51040642 is 24604015.

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., 44076321 + 6964321 = 6639^2 + 2639^2 .

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, 12760159 + ... + 12760162.

Almost surely, 2^51040642 is an apocalyptic number.

51040642 is a deficient number, since it is larger than the sum of its proper divisors (25520324).

51040642 is a wasteful number, since it uses less digits than its factorization.

51040642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25520323.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 51040642 is about 7144.2733710294. The cubic root of 51040642 is about 370.9414592695.

Adding to 51040642 its reverse (24604015), we get a palindrome (75644657).

The spelling of 51040642 in words is "fifty-one million, forty thousand, six hundred forty-two".