13065991 has 2 divisors, whose sum is σ = 13065992. Its totient is φ = 13065990.

The previous prime is 13065971. The next prime is 13066049. The reversal of 13065991 is 19956031.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13065991 - 2¹⁹ = 12541703 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13065961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6532995 + 6532996.

It is an arithmetic number, because the mean of its divisors is an integer number (6532996).

Almost surely, 2^13065991 is an apocalyptic number.

13065991 is a deficient number, since it is larger than the sum of its proper divisors (1).

13065991 is an equidigital number, since it uses as much as digits as its factorization.

13065991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7290, while the sum is 34.

The square root of 13065991 is about 3614.6909964754. The cubic root of 13065991 is about 235.5306613642.

The spelling of 13065991 in words is "thirteen million, sixty-five thousand, nine hundred ninety-one".