13000991 has 4 divisors (see below), whose sum is σ = 13214184. Its totient is φ = 12787800.

The previous prime is 13000987. The next prime is 13000993. The reversal of 13000991 is 19900031.

13000991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19900031 = 3529 ⋅5639.

It is a cyclic number.

It is not a de Polignac number, because 13000991 - 2² = 13000987 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 (13000993) 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, 106505 + ... + 106626.

It is an arithmetic number, because the mean of its divisors is an integer number (3303546).

Almost surely, 2^13000991 is an apocalyptic number.

13000991 is a deficient number, since it is larger than the sum of its proper divisors (213193).

13000991 is an equidigital number, since it uses as much as digits as its factorization.

13000991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213192.

The product of its (nonzero) digits is 243, while the sum is 23.

The square root of 13000991 is about 3605.6886998187. The cubic root of 13000991 is about 235.1394434220.

The spelling of 13000991 in words is "thirteen million, nine hundred ninety-one", and thus it is an aban number.