51000042311 has 4 divisors (see below), whose sum is σ = 52243945824. Its totient is φ = 49756138800.

The previous prime is 51000042253. The next prime is 51000042343. The reversal of 51000042311 is 11324000015.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11324000015 = 5 ⋅2264800003.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51000042311 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51000042311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51000042391) 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, 621951695 + ... + 621951776.

It is an arithmetic number, because the mean of its divisors is an integer number (13060986456).

Almost surely, 2^51000042311 is an apocalyptic number.

51000042311 is a deficient number, since it is larger than the sum of its proper divisors (1243903513).

51000042311 is a wasteful number, since it uses less digits than its factorization.

51000042311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1243903512.

The product of its (nonzero) digits is 120, while the sum is 17.

Adding to 51000042311 its reverse (11324000015), we get a palindrome (62324042326).

The spelling of 51000042311 in words is "fifty-one billion, forty-two thousand, three hundred eleven".