51191011 has 4 divisors (see below), whose sum is σ = 51497712. Its totient is φ = 50884312.

The previous prime is 51190991. The next prime is 51191039. The reversal of 51191011 is 11019115.

51191011 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.

It is a cyclic number.

It is not a de Polignac number, because 51191011 - 2¹³ = 51182819 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 51191011.

It is not an unprimeable number, because it can be changed into a prime (51191611) 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, 153100 + ... + 153433.

It is an arithmetic number, because the mean of its divisors is an integer number (12874428).

Almost surely, 2^51191011 is an apocalyptic number.

51191011 is a deficient number, since it is larger than the sum of its proper divisors (306701).

51191011 is a wasteful number, since it uses less digits than its factorization.

51191011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306700.

The product of its (nonzero) digits is 45, while the sum is 19.

The square root of 51191011 is about 7154.7893749572. The cubic root of 51191011 is about 371.3053745619.

It can be divided in two parts, 5 and 1191011, that added together give a cube (1191016 = 106³).

The spelling of 51191011 in words is "fifty-one million, one hundred ninety-one thousand, eleven".