13770561 has 24 divisors (see below), whose sum is σ = 22300480. Its totient is φ = 7402752.

The previous prime is 13770557. The next prime is 13770571. The reversal of 13770561 is 16507731.

It is not a de Polignac number, because 13770561 - 2² = 13770557 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 (13770511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4935 + ... + 7203.

Almost surely, 2^13770561 is an apocalyptic number.

It is an amenable number.

13770561 is a deficient number, since it is larger than the sum of its proper divisors (8529919).

13770561 is a wasteful number, since it uses less digits than its factorization.

13770561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2313 (or 2296 counting only the distinct ones).

The product of its (nonzero) digits is 4410, while the sum is 30.

The square root of 13770561 is about 3710.8706525558. The cubic root of 13770561 is about 239.6903471793.

The spelling of 13770561 in words is "thirteen million, seven hundred seventy thousand, five hundred sixty-one".