13123157081 has 4 divisors (see below), whose sum is σ = 13693729152. Its totient is φ = 12552585012.

The previous prime is 13123157059. The next prime is 13123157137. The reversal of 13123157081 is 18075132131.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13123157081 is a prime.

It is a super-2 number, since 2×13123157081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13123157051) 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, 285286001 + ... + 285286046.

It is an arithmetic number, because the mean of its divisors is an integer number (3423432288).

Almost surely, 2^13123157081 is an apocalyptic number.

It is an amenable number.

13123157081 is a deficient number, since it is larger than the sum of its proper divisors (570572071).

13123157081 is an equidigital number, since it uses as much as digits as its factorization.

13123157081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570572070.

The product of its (nonzero) digits is 5040, while the sum is 32.

The spelling of 13123157081 in words is "thirteen billion, one hundred twenty-three million, one hundred fifty-seven thousand, eighty-one".