13491689 has 2 divisors, whose sum is σ = 13491690. Its totient is φ = 13491688.

The previous prime is 13491677. The next prime is 13491697. The reversal of 13491689 is 98619431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7075600 + 6416089 = 2660^2 + 2533^2 .

It is a cyclic number.

It is not a de Polignac number, because 13491689 - 2⁸ = 13491433 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13491619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6745844 + 6745845.

It is an arithmetic number, because the mean of its divisors is an integer number (6745845).

Almost surely, 2^13491689 is an apocalyptic number.

It is an amenable number.

13491689 is a deficient number, since it is larger than the sum of its proper divisors (1).

13491689 is an equidigital number, since it uses as much as digits as its factorization.

13491689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 41.

The square root of 13491689 is about 3673.1034562070. The cubic root of 13491689 is about 238.0612852086.

The spelling of 13491689 in words is "thirteen million, four hundred ninety-one thousand, six hundred eighty-nine".