51031320403 has 32 divisors (see below), whose sum is σ = 61909466112. Its totient is φ = 41117155200.

The previous prime is 51031320377. The next prime is 51031320427. The reversal of 51031320403 is 30402313015.

It is not a de Polignac number, because 51031320403 - 2¹⁷ = 51031189331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51035320403) 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 31 ways as a sum of consecutive naturals, for example, 20161248 + ... + 20163778.

It is an arithmetic number, because the mean of its divisors is an integer number (1934670816).

Almost surely, 2^51031320403 is an apocalyptic number.

51031320403 is a deficient number, since it is larger than the sum of its proper divisors (10878145709).

51031320403 is a wasteful number, since it uses less digits than its factorization.

51031320403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4675.

The product of its (nonzero) digits is 1080, while the sum is 22.

Adding to 51031320403 its reverse (30402313015), we get a palindrome (81433633418).

The spelling of 51031320403 in words is "fifty-one billion, thirty-one million, three hundred twenty thousand, four hundred three".