13131232031 has 4 divisors (see below), whose sum is σ = 13486130232. Its totient is φ = 12776333832.

The previous prime is 13131232007. The next prime is 13131232067. The reversal of 13131232031 is 13023213131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13023213131 = 947 ⋅13752073.

It is a cyclic number.

It is not a de Polignac number, because 13131232031 - 2²² = 13127037727 is a prime.

It is a super-2 number, since 2×13131232031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13131231994 and 13131232012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13131232091) 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, 177449045 + ... + 177449118.

It is an arithmetic number, because the mean of its divisors is an integer number (3371532558).

Almost surely, 2^13131232031 is an apocalyptic number.

13131232031 is a deficient number, since it is larger than the sum of its proper divisors (354898201).

13131232031 is an equidigital number, since it uses as much as digits as its factorization.

13131232031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354898200.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 13131232031 its reverse (13023213131), we get a palindrome (26154445162).

The spelling of 13131232031 in words is "thirteen billion, one hundred thirty-one million, two hundred thirty-two thousand, thirty-one".