13156531613 has 4 divisors (see below), whose sum is σ = 13203021408. Its totient is φ = 13110041820.

The previous prime is 13156531571. The next prime is 13156531621. The reversal of 13156531613 is 31613565131.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31613565131 = 19 ⋅1663871849.

It is a cyclic number.

It is not a de Polignac number, because 13156531613 - 2³² = 8861564317 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 (13156534613) 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, 23244473 + ... + 23245038.

It is an arithmetic number, because the mean of its divisors is an integer number (3300755352).

Almost surely, 2^13156531613 is an apocalyptic number.

It is an amenable number.

13156531613 is a deficient number, since it is larger than the sum of its proper divisors (46489795).

13156531613 is an equidigital number, since it uses as much as digits as its factorization.

13156531613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46489794.

The product of its digits is 24300, while the sum is 35.

The spelling of 13156531613 in words is "thirteen billion, one hundred fifty-six million, five hundred thirty-one thousand, six hundred thirteen".