231020002013 has 4 divisors (see below), whose sum is σ = 231301391388. Its totient is φ = 230738612640.

The previous prime is 231020001983. The next prime is 231020002021. The reversal of 231020002013 is 310200020132.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 91773855364 + 139246146649 = 302942^2 + 373157^2 .

It is a cyclic number.

It is not a de Polignac number, because 231020002013 - 2¹² = 231019997917 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 (231020002313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140693456 + ... + 140695097.

It is an arithmetic number, because the mean of its divisors is an integer number (57825347847).

Almost surely, 2^231020002013 is an apocalyptic number.

It is an amenable number.

231020002013 is a deficient number, since it is larger than the sum of its proper divisors (281389375).

231020002013 is an equidigital number, since it uses as much as digits as its factorization.

231020002013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281389374.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 231020002013 its reverse (310200020132), we get a palindrome (541220022145).

It can be divided in two parts, 2 and 31020002013, that multiplied together give a palindrome (62040004026).

The spelling of 231020002013 in words is "two hundred thirty-one billion, twenty million, two thousand, thirteen".