51780011 has 4 divisors (see below), whose sum is σ = 54825912. Its totient is φ = 48734112.

The previous prime is 51779989. The next prime is 51780017. The reversal of 51780011 is 11008715.

51780011 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11008715 = 5 ⋅2201743.

It is a cyclic number.

It is not a de Polignac number, because 51780011 - 2¹⁸ = 51517867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51780017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1522925 + ... + 1522958.

It is an arithmetic number, because the mean of its divisors is an integer number (13706478).

Almost surely, 2^51780011 is an apocalyptic number.

51780011 is a deficient number, since it is larger than the sum of its proper divisors (3045901).

51780011 is a wasteful number, since it uses less digits than its factorization.

51780011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3045900.

The product of its (nonzero) digits is 280, while the sum is 23.

The square root of 51780011 is about 7195.8328913337. The cubic root of 51780011 is about 372.7240182165.

Adding to 51780011 its reverse (11008715), we get a palindrome (62788726).

The spelling of 51780011 in words is "fifty-one million, seven hundred eighty thousand, eleven".