13229991 has 12 divisors (see below), whose sum is σ = 19941168. Its totient is φ = 8436384.

The previous prime is 13229981. The next prime is 13229999. The reversal of 13229991 is 19992231.

It is a happy number.

It is not a de Polignac number, because 13229991 - 2⁹ = 13229479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13229999) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31750 + ... + 32163.

It is an arithmetic number, because the mean of its divisors is an integer number (1661764).

Almost surely, 2^13229991 is an apocalyptic number.

13229991 is a deficient number, since it is larger than the sum of its proper divisors (6711177).

13229991 is a wasteful number, since it uses less digits than its factorization.

13229991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63942 (or 63939 counting only the distinct ones).

The product of its digits is 8748, while the sum is 36.

The square root of 13229991 is about 3637.3054587153. The cubic root of 13229991 is about 236.5120012623.

The spelling of 13229991 in words is "thirteen million, two hundred twenty-nine thousand, nine hundred ninety-one".