13520977 has 4 divisors (see below), whose sum is σ = 13531120. Its totient is φ = 13510836.

The previous prime is 13520957. The next prime is 13520981. The reversal of 13520977 is 77902531.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13520977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13520917) 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, 2703 + ... + 5860.

It is an arithmetic number, because the mean of its divisors is an integer number (3382780).

Almost surely, 2^13520977 is an apocalyptic number.

It is an amenable number.

13520977 is a deficient number, since it is larger than the sum of its proper divisors (10143).

13520977 is an equidigital number, since it uses as much as digits as its factorization.

13520977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10142.

The product of its (nonzero) digits is 13230, while the sum is 34.

The square root of 13520977 is about 3677.0881142556. The cubic root of 13520977 is about 238.2334232750.

It can be divided in two parts, 135 and 20977, that added together give a palindrome (21112).

The spelling of 13520977 in words is "thirteen million, five hundred twenty thousand, nine hundred seventy-seven".