13195991 has 8 divisors (see below), whose sum is σ = 13470960. Its totient is φ = 12923712.

The previous prime is 13195981. The next prime is 13196009. The reversal of 13195991 is 19959131.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13195991 - 2¹⁰ = 13194967 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 (13195981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11345 + ... + 12453.

It is an arithmetic number, because the mean of its divisors is an integer number (1683870).

Almost surely, 2^13195991 is an apocalyptic number.

13195991 is a deficient number, since it is larger than the sum of its proper divisors (274969).

13195991 is a wasteful number, since it uses less digits than its factorization.

13195991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1345.

The product of its digits is 10935, while the sum is 38.

The square root of 13195991 is about 3632.6286625528. The cubic root of 13195991 is about 236.3092219235.

The spelling of 13195991 in words is "thirteen million, one hundred ninety-five thousand, nine hundred ninety-one".