13661897 has 12 divisors (see below), whose sum is σ = 14879676. Its totient is φ = 12533760.

The previous prime is 13661881. The next prime is 13661909. The reversal of 13661897 is 79816631.

13661897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 383161 + 13278736 = 619^2 + 3644^2 .

It is not a de Polignac number, because 13661897 - 2⁴ = 13661881 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13661497) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11273 + ... + 12425.

It is an arithmetic number, because the mean of its divisors is an integer number (1239973).

Almost surely, 2^13661897 is an apocalyptic number.

13661897 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

13661897 is a deficient number, since it is larger than the sum of its proper divisors (1217779).

13661897 is a wasteful number, since it uses less digits than its factorization.

13661897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1228 (or 1211 counting only the distinct ones).

The product of its digits is 54432, while the sum is 41.

The square root of 13661897 is about 3696.2003463016. The cubic root of 13661897 is about 239.0582130919.

The spelling of 13661897 in words is "thirteen million, six hundred sixty-one thousand, eight hundred ninety-seven".