51031320151 has 4 divisors (see below), whose sum is σ = 58321508752. Its totient is φ = 43741131552.

The previous prime is 51031320121. The next prime is 51031320161. The reversal of 51031320151 is 15102313015.

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 51031320151 - 2¹³ = 51031311959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51031320101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3645094290 + ... + 3645094303.

It is an arithmetic number, because the mean of its divisors is an integer number (14580377188).

Almost surely, 2^51031320151 is an apocalyptic number.

51031320151 is a deficient number, since it is larger than the sum of its proper divisors (7290188601).

51031320151 is an equidigital number, since it uses as much as digits as its factorization.

51031320151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7290188600.

The product of its (nonzero) digits is 450, while the sum is 22.

Adding to 51031320151 its reverse (15102313015), we get a palindrome (66133633166).

The spelling of 51031320151 in words is "fifty-one billion, thirty-one million, three hundred twenty thousand, one hundred fifty-one".