13165649 has 4 divisors (see below), whose sum is σ = 15046464. Its totient is φ = 11284836.

The previous prime is 13165639. The next prime is 13165657. The reversal of 13165649 is 94656131.

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: 94656131 = 941 ⋅100591.

It is a cyclic number.

It is not a de Polignac number, because 13165649 - 2⁸ = 13165393 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13165639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 940397 + ... + 940410.

It is an arithmetic number, because the mean of its divisors is an integer number (3761616).

Almost surely, 2^13165649 is an apocalyptic number.

It is an amenable number.

13165649 is a deficient number, since it is larger than the sum of its proper divisors (1880815).

13165649 is an equidigital number, since it uses as much as digits as its factorization.

13165649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1880814.

The product of its digits is 19440, while the sum is 35.

The square root of 13165649 is about 3628.4499445355. The cubic root of 13165649 is about 236.1279649310.

The spelling of 13165649 in words is "thirteen million, one hundred sixty-five thousand, six hundred forty-nine".