13481861 has 2 divisors, whose sum is σ = 13481862. Its totient is φ = 13481860.

The previous prime is 13481851. The next prime is 13481863. The reversal of 13481861 is 16818431.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12285025 + 1196836 = 3505^2 + 1094^2 .

It is a cyclic number.

It is not a de Polignac number, because 13481861 - 2¹⁴ = 13465477 is a prime.

It is a Sophie Germain prime.

Together with 13481863, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13481863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6740930 + 6740931.

It is an arithmetic number, because the mean of its divisors is an integer number (6740931).

Almost surely, 2^13481861 is an apocalyptic number.

It is an amenable number.

13481861 is a deficient number, since it is larger than the sum of its proper divisors (1).

13481861 is an equidigital number, since it uses as much as digits as its factorization.

13481861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 32.

The square root of 13481861 is about 3671.7653792147. The cubic root of 13481861 is about 238.0034660418.

The spelling of 13481861 in words is "thirteen million, four hundred eighty-one thousand, eight hundred sixty-one".