51061811 has 4 divisors (see below), whose sum is σ = 51201312. Its totient is φ = 50922312.

The previous prime is 51061807. The next prime is 51061823. The reversal of 51061811 is 11816015.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11816015 = 5 ⋅2363203.

It is a cyclic number.

It is not a de Polignac number, because 51061811 - 2² = 51061807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51061831) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 69200 + ... + 69933.

It is an arithmetic number, because the mean of its divisors is an integer number (12800328).

Almost surely, 2^51061811 is an apocalyptic number.

51061811 is a deficient number, since it is larger than the sum of its proper divisors (139501).

51061811 is a wasteful number, since it uses less digits than its factorization.

51061811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139500.

The product of its (nonzero) digits is 240, while the sum is 23.

The square root of 51061811 is about 7145.7547536982. The cubic root of 51061811 is about 370.9927345807.

Adding to 51061811 its reverse (11816015), we get a palindrome (62877826).

The spelling of 51061811 in words is "fifty-one million, sixty-one thousand, eight hundred eleven".