13151991 has 8 divisors (see below), whose sum is σ = 17579520. Its totient is φ = 8746232.

The previous prime is 13151989. The next prime is 13152011. The reversal of 13151991 is 19915131.

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 13151991 - 2¹ = 13151989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13151911) 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, 3975 + ... + 6488.

It is an arithmetic number, because the mean of its divisors is an integer number (2197440).

Almost surely, 2^13151991 is an apocalyptic number.

13151991 is a deficient number, since it is larger than the sum of its proper divisors (4427529).

13151991 is a wasteful number, since it uses less digits than its factorization.

13151991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10885.

The product of its digits is 1215, while the sum is 30.

The square root of 13151991 is about 3626.5673852832. The cubic root of 13151991 is about 236.0462838937.

The spelling of 13151991 in words is "thirteen million, one hundred fifty-one thousand, nine hundred ninety-one".