13430991 has 8 divisors (see below), whose sum is σ = 20466304. Its totient is φ = 7674840.

The previous prime is 13430981. The next prime is 13430993. The reversal of 13430991 is 19903431.

13430991 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 13430991 - 2⁵ = 13430959 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13430993) 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, 319765 + ... + 319806.

It is an arithmetic number, because the mean of its divisors is an integer number (2558288).

Almost surely, 2^13430991 is an apocalyptic number.

13430991 is a deficient number, since it is larger than the sum of its proper divisors (7035313).

13430991 is an equidigital number, since it uses as much as digits as its factorization.

13430991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639581.

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 13430991 is about 3664.8316468837. The cubic root of 13430991 is about 237.7037424338.

It can be divided in two parts, 134 and 30991, that added together give a triangular number (31125 = T₂₄₉).

The spelling of 13430991 in words is "thirteen million, four hundred thirty thousand, nine hundred ninety-one".