13081906 has 4 divisors (see below), whose sum is σ = 19622862. Its totient is φ = 6540952.

The previous prime is 13081903. The next prime is 13081909. The reversal of 13081906 is 60918031.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60918031 = 59 ⋅1032509.

It is an interprime number because it is at equal distance from previous prime (13081903) and next prime (13081909).

It can be written as a sum of positive squares in only one way, i.e., 6806881 + 6275025 = 2609^2 + 2505^2 .

It is a super-2 number, since 2×13081906² = 342272529185672, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13081903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3270475 + ... + 3270478.

Almost surely, 2^13081906 is an apocalyptic number.

13081906 is a deficient number, since it is larger than the sum of its proper divisors (6540956).

13081906 is an equidigital number, since it uses as much as digits as its factorization.

13081906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6540955.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 13081906 is about 3616.8917595084. The cubic root of 13081906 is about 235.6262517552.

Adding to 13081906 its reverse (60918031), we get a palindrome (73999937).

The spelling of 13081906 in words is "thirteen million, eighty-one thousand, nine hundred six".