13591861 has 2 divisors, whose sum is σ = 13591862. Its totient is φ = 13591860.

The previous prime is 13591843. The next prime is 13591867. The reversal of 13591861 is 16819531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13322500 + 269361 = 3650^2 + 519^2 .

It is an emirp because it is prime and its reverse (16819531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13591861 - 2⁵ = 13591829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13591867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6795930 + 6795931.

It is an arithmetic number, because the mean of its divisors is an integer number (6795931).

Almost surely, 2^13591861 is an apocalyptic number.

It is an amenable number.

13591861 is a deficient number, since it is larger than the sum of its proper divisors (1).

13591861 is an equidigital number, since it uses as much as digits as its factorization.

13591861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 34.

The square root of 13591861 is about 3686.7141196464. The cubic root of 13591861 is about 238.6490124144.

The spelling of 13591861 in words is "thirteen million, five hundred ninety-one thousand, eight hundred sixty-one".