13777971 has 4 divisors (see below), whose sum is σ = 18370632. Its totient is φ = 9185312.

The previous prime is 13777969. The next prime is 13777979. The reversal of 13777971 is 17977731.

13777971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13777971 - 2¹ = 13777969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13777979) 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, 2296326 + ... + 2296331.

It is an arithmetic number, because the mean of its divisors is an integer number (4592658).

Almost surely, 2^13777971 is an apocalyptic number.

13777971 is a deficient number, since it is larger than the sum of its proper divisors (4592661).

13777971 is an equidigital number, since it uses as much as digits as its factorization.

13777971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4592660.

The product of its digits is 64827, while the sum is 42.

The square root of 13777971 is about 3711.8689362638. The cubic root of 13777971 is about 239.7333322833.

The spelling of 13777971 in words is "thirteen million, seven hundred seventy-seven thousand, nine hundred seventy-one".