13661157 has 4 divisors (see below), whose sum is σ = 18214880. Its totient is φ = 9107436.

The previous prime is 13661083. The next prime is 13661191. The reversal of 13661157 is 75116631.

13661157 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75116631 = 3 ⋅25038877.

It is not a de Polignac number, because 13661157 - 2⁸ = 13660901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13661357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2276857 + ... + 2276862.

It is an arithmetic number, because the mean of its divisors is an integer number (4553720).

Almost surely, 2^13661157 is an apocalyptic number.

It is an amenable number.

13661157 is a deficient number, since it is larger than the sum of its proper divisors (4553723).

13661157 is an equidigital number, since it uses as much as digits as its factorization.

13661157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4553722.

The product of its digits is 3780, while the sum is 30.

The square root of 13661157 is about 3696.1002421471. The cubic root of 13661157 is about 239.0538967983.

Adding to 13661157 its reverse (75116631), we get a palindrome (88777788).

The spelling of 13661157 in words is "thirteen million, six hundred sixty-one thousand, one hundred fifty-seven".