51056811 has 20 divisors (see below), whose sum is σ = 82138672. Its totient is φ = 31418928.

The previous prime is 51056809. The next prime is 51056827. The reversal of 51056811 is 11865015.

It is not a de Polignac number, because 51056811 - 2¹ = 51056809 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51056851) 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 19 ways as a sum of consecutive naturals, for example, 23191 + ... + 25296.

Almost surely, 2^51056811 is an apocalyptic number.

51056811 is a deficient number, since it is larger than the sum of its proper divisors (31081861).

51056811 is a wasteful number, since it uses less digits than its factorization.

51056811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48512 (or 48503 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 27.

The square root of 51056811 is about 7145.4048870585. The cubic root of 51056811 is about 370.9806249160.

The spelling of 51056811 in words is "fifty-one million, fifty-six thousand, eight hundred eleven".