51535571091 has 4 divisors (see below), whose sum is σ = 68714094792. Its totient is φ = 34357047392.

The previous prime is 51535571039. The next prime is 51535571099. The reversal of 51535571091 is 19017553515.

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 51535571091 - 2⁹ = 51535570579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51535571099) 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, 8589261846 + ... + 8589261851.

It is an arithmetic number, because the mean of its divisors is an integer number (17178523698).

Almost surely, 2^51535571091 is an apocalyptic number.

51535571091 is a deficient number, since it is larger than the sum of its proper divisors (17178523701).

51535571091 is a wasteful number, since it uses less digits than its factorization.

51535571091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17178523700.

The product of its (nonzero) digits is 118125, while the sum is 42.

The spelling of 51535571091 in words is "fifty-one billion, five hundred thirty-five million, five hundred seventy-one thousand, ninety-one".