13937561 has 4 divisors (see below), whose sum is σ = 15204624. Its totient is φ = 12670500.

The previous prime is 13937551. The next prime is 13937579. The reversal of 13937561 is 16573931.

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: 16573931 = 11 ⋅1506721.

It is a cyclic number.

It is not a de Polignac number, because 13937561 - 2¹⁰ = 13936537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13937531) 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, 633515 + ... + 633536.

It is an arithmetic number, because the mean of its divisors is an integer number (3801156).

Almost surely, 2^13937561 is an apocalyptic number.

13937561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13937561 is a deficient number, since it is larger than the sum of its proper divisors (1267063).

13937561 is a wasteful number, since it uses less digits than its factorization.

13937561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1267062.

The product of its digits is 17010, while the sum is 35.

The square root of 13937561 is about 3733.3043004823. The cubic root of 13937561 is about 240.6553903484.

The spelling of 13937561 in words is "thirteen million, nine hundred thirty-seven thousand, five hundred sixty-one".