13581977 has 4 divisors (see below), whose sum is σ = 13812240. Its totient is φ = 13351716.

The previous prime is 13581973. The next prime is 13581991. The reversal of 13581977 is 77918531.

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.

It is a cyclic number.

It is not a de Polignac number, because 13581977 - 2² = 13581973 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13581973) 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, 115043 + ... + 115160.

It is an arithmetic number, because the mean of its divisors is an integer number (3453060).

Almost surely, 2^13581977 is an apocalyptic number.

It is an amenable number.

13581977 is a deficient number, since it is larger than the sum of its proper divisors (230263).

13581977 is an equidigital number, since it uses as much as digits as its factorization.

13581977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230262.

The product of its digits is 52920, while the sum is 41.

The square root of 13581977 is about 3685.3733867819. The cubic root of 13581977 is about 238.5911498734.

The spelling of 13581977 in words is "thirteen million, five hundred eighty-one thousand, nine hundred seventy-seven".