13146991 has 16 divisors (see below), whose sum is σ = 15634080. Its totient is φ = 10897920.

The previous prime is 13146979. The next prime is 13146997. The reversal of 13146991 is 19964131.

It is a happy number.

It is not a de Polignac number, because 13146991 - 2⁹ = 13146479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13146997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12211 + ... + 13243.

It is an arithmetic number, because the mean of its divisors is an integer number (977130).

Almost surely, 2^13146991 is an apocalyptic number.

13146991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13146991 is a deficient number, since it is larger than the sum of its proper divisors (2487089).

13146991 is a wasteful number, since it uses less digits than its factorization.

13146991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1146.

The product of its digits is 5832, while the sum is 34.

The square root of 13146991 is about 3625.8779626457. The cubic root of 13146991 is about 236.0163674850.

The spelling of 13146991 in words is "thirteen million, one hundred forty-six thousand, nine hundred ninety-one".