13125881 has 4 divisors (see below), whose sum is σ = 13134672. Its totient is φ = 13117092.

The previous prime is 13125877. The next prime is 13125883. The reversal of 13125881 is 18852131.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 13125881 - 2² = 13125877 is a prime.

It is a super-2 number, since 2×13125881² = 344577504052322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13125883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1535 + ... + 5348.

It is an arithmetic number, because the mean of its divisors is an integer number (3283668).

Almost surely, 2^13125881 is an apocalyptic number.

It is an amenable number.

13125881 is a deficient number, since it is larger than the sum of its proper divisors (8791).

13125881 is an equidigital number, since it uses as much as digits as its factorization.

13125881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8790.

The product of its digits is 1920, while the sum is 29.

The square root of 13125881 is about 3622.9657740586. The cubic root of 13125881 is about 235.8899767243.

The spelling of 13125881 in words is "thirteen million, one hundred twenty-five thousand, eight hundred eighty-one".