13012011231 has 4 divisors (see below), whose sum is σ = 17349348312. Its totient is φ = 8674674152.

The previous prime is 13012011211. The next prime is 13012011239. The reversal of 13012011231 is 13211021031.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 13012011231 - 2¹⁴ = 13011994847 is a prime.

It is a super-2 number, since 2×13012011231² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13012011231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13012011239) 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, 2168668536 + ... + 2168668541.

It is an arithmetic number, because the mean of its divisors is an integer number (4337337078).

Almost surely, 2^13012011231 is an apocalyptic number.

13012011231 is a deficient number, since it is larger than the sum of its proper divisors (4337337081).

13012011231 is an equidigital number, since it uses as much as digits as its factorization.

13012011231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4337337080.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 13012011231 its reverse (13211021031), we get a palindrome (26223032262).

The spelling of 13012011231 in words is "thirteen billion, twelve million, eleven thousand, two hundred thirty-one".