13161261312431 has 4 divisors (see below), whose sum is σ = 13377019694664. Its totient is φ = 12945502930200.

The previous prime is 13161261312413. The next prime is 13161261312439. The reversal of 13161261312431 is 13421316216131.

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 13161261312431 - 2²⁶ = 13161194203567 is a prime.

It is a super-3 number, since 3×13161261312431³ (a number of 40 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13161261312391 and 13161261312400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13161261312439) 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, 107879191025 + ... + 107879191146.

It is an arithmetic number, because the mean of its divisors is an integer number (3344254923666).

Almost surely, 2^{13161261312431} is an apocalyptic number.

13161261312431 is a deficient number, since it is larger than the sum of its proper divisors (215758382233).

13161261312431 is an equidigital number, since it uses as much as digits as its factorization.

13161261312431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215758382232.

The product of its digits is 15552, while the sum is 35.

Adding to 13161261312431 its reverse (13421316216131), we get a palindrome (26582577528562).

The spelling of 13161261312431 in words is "thirteen trillion, one hundred sixty-one billion, two hundred sixty-one million, three hundred twelve thousand, four hundred thirty-one".