13087861 has 2 divisors, whose sum is σ = 13087862. Its totient is φ = 13087860.

The previous prime is 13087819. The next prime is 13087871. The reversal of 13087861 is 16878031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11662225 + 1425636 = 3415^2 + 1194^2 .

It is a cyclic number.

It is not a de Polignac number, because 13087861 - 2¹⁵ = 13055093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13087871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6543930 + 6543931.

It is an arithmetic number, because the mean of its divisors is an integer number (6543931).

Almost surely, 2^13087861 is an apocalyptic number.

It is an amenable number.

13087861 is a deficient number, since it is larger than the sum of its proper divisors (1).

13087861 is an equidigital number, since it uses as much as digits as its factorization.

13087861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 13087861 is about 3617.7148864995. The cubic root of 13087861 is about 235.6619993870.

The spelling of 13087861 in words is "thirteen million, eighty-seven thousand, eight hundred sixty-one".