31303420513 has 8 divisors (see below), whose sum is σ = 31420775016. Its totient is φ = 31186108800.

The previous prime is 31303420507. The next prime is 31303420523. The reversal of 31303420513 is 31502430313.

It can be written as a sum of positive squares in 4 ways, for example, as 7106995809 + 24196424704 = 84303^2 + 155552^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31303420513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31303420523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2898183 + ... + 2908963.

It is an arithmetic number, because the mean of its divisors is an integer number (3927596877).

Almost surely, 2^31303420513 is an apocalyptic number.

It is an amenable number.

31303420513 is a deficient number, since it is larger than the sum of its proper divisors (117354503).

31303420513 is a wasteful number, since it uses less digits than its factorization.

31303420513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21395.

The product of its (nonzero) digits is 3240, while the sum is 25.

Adding to 31303420513 its reverse (31502430313), we get a palindrome (62805850826).

The spelling of 31303420513 in words is "thirty-one billion, three hundred three million, four hundred twenty thousand, five hundred thirteen".