51155305331 has 4 divisors (see below), whose sum is σ = 55090328832. Its totient is φ = 47220281832.

The previous prime is 51155305259. The next prime is 51155305339. The reversal of 51155305331 is 13350355115.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51155305331 is a prime.

It is a super-2 number, since 2×51155305331² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51155305339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1967511731 + ... + 1967511756.

It is an arithmetic number, because the mean of its divisors is an integer number (13772582208).

Almost surely, 2^51155305331 is an apocalyptic number.

51155305331 is a deficient number, since it is larger than the sum of its proper divisors (3935023501).

51155305331 is a wasteful number, since it uses less digits than its factorization.

51155305331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3935023500.

The product of its (nonzero) digits is 16875, while the sum is 32.

The spelling of 51155305331 in words is "fifty-one billion, one hundred fifty-five million, three hundred five thousand, three hundred thirty-one".