13001861 has 2 divisors, whose sum is σ = 13001862. Its totient is φ = 13001860.

The previous prime is 13001843. The next prime is 13001897. The reversal of 13001861 is 16810031.

13001861 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10176100 + 2825761 = 3190^2 + 1681^2 .

It is a cyclic number.

It is not a de Polignac number, because 13001861 - 2¹⁸ = 12739717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13001161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6500930 + 6500931.

It is an arithmetic number, because the mean of its divisors is an integer number (6500931).

Almost surely, 2^13001861 is an apocalyptic number.

It is an amenable number.

13001861 is a deficient number, since it is larger than the sum of its proper divisors (1).

13001861 is an equidigital number, since it uses as much as digits as its factorization.

13001861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 13001861 is about 3605.8093404949. The cubic root of 13001861 is about 235.1446883235.

Adding to 13001861 its reverse (16810031), we get a palindrome (29811892).

The spelling of 13001861 in words is "thirteen million, one thousand, eight hundred sixty-one".