13531213031 has 4 divisors (see below), whose sum is σ = 15464243472. Its totient is φ = 11598182592.

The previous prime is 13531213027. The next prime is 13531213049. The reversal of 13531213031 is 13031213531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13031213531 = 7 ⋅1861601933.

It is a cyclic number.

It is not a de Polignac number, because 13531213031 - 2² = 13531213027 is a prime.

It is a super-2 number, since 2×13531213031² (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 = 13531212988 and 13531213006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13531213061) 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, 966515210 + ... + 966515223.

It is an arithmetic number, because the mean of its divisors is an integer number (3866060868).

Almost surely, 2^13531213031 is an apocalyptic number.

13531213031 is a deficient number, since it is larger than the sum of its proper divisors (1933030441).

13531213031 is an equidigital number, since it uses as much as digits as its factorization.

13531213031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1933030440.

The product of its (nonzero) digits is 810, while the sum is 23.

Adding to 13531213031 its reverse (13031213531), we get a palindrome (26562426562).

The spelling of 13531213031 in words is "thirteen billion, five hundred thirty-one million, two hundred thirteen thousand, thirty-one".