31201020013 has 4 divisors (see below), whose sum is σ = 31204952128. Its totient is φ = 31197087900.

The previous prime is 31201019987. The next prime is 31201020029. The reversal of 31201020013 is 31002010213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31201020013 - 2³³ = 22611085421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31201019975 and 31201020002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31201020043) 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, 1954131 + ... + 1970032.

It is an arithmetic number, because the mean of its divisors is an integer number (7801238032).

Almost surely, 2^31201020013 is an apocalyptic number.

It is an amenable number.

31201020013 is a deficient number, since it is larger than the sum of its proper divisors (3932115).

31201020013 is an equidigital number, since it uses as much as digits as its factorization.

31201020013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3932114.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 31201020013 its reverse (31002010213), we get a palindrome (62203030226).

It can be divided in two parts, 312010200 and 13, that added together give a palindrome (312010213).

The spelling of 31201020013 in words is "thirty-one billion, two hundred one million, twenty thousand, thirteen".