51031356413 has 8 divisors (see below), whose sum is σ = 52414054968. Its totient is φ = 49648840704.

The previous prime is 51031356371. The next prime is 51031356419. The reversal of 51031356413 is 31465313015.

It can be written as a sum of positive squares in 4 ways, for example, as 14275948324 + 36755408089 = 119482^2 + 191717^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51031356413 - 2⁸ = 51031356157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51031356413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51031356419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 669545 + ... + 741857.

It is an arithmetic number, because the mean of its divisors is an integer number (6551756871).

Almost surely, 2^51031356413 is an apocalyptic number.

It is an amenable number.

51031356413 is a deficient number, since it is larger than the sum of its proper divisors (1382698555).

51031356413 is a wasteful number, since it uses less digits than its factorization.

51031356413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91423.

The product of its (nonzero) digits is 16200, while the sum is 32.

Adding to 51031356413 its reverse (31465313015), we get a palindrome (82496669428).

The spelling of 51031356413 in words is "fifty-one billion, thirty-one million, three hundred fifty-six thousand, four hundred thirteen".