13761561 has 8 divisors (see below), whose sum is σ = 20016864. Its totient is φ = 8340320.

The previous prime is 13761557. The next prime is 13761569. The reversal of 13761561 is 16516731.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13761561 - 2² = 13761557 is a prime.

It is a super-2 number, since 2×13761561² = 378761122313442, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13761569) 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 7 ways as a sum of consecutive naturals, for example, 208476 + ... + 208541.

It is an arithmetic number, because the mean of its divisors is an integer number (2502108).

Almost surely, 2^13761561 is an apocalyptic number.

13761561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13761561 is a deficient number, since it is larger than the sum of its proper divisors (6255303).

13761561 is a wasteful number, since it uses less digits than its factorization.

13761561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417031.

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

The square root of 13761561 is about 3709.6578009299. The cubic root of 13761561 is about 239.6381178074.

The spelling of 13761561 in words is "thirteen million, seven hundred sixty-one thousand, five hundred sixty-one".