11715121 has 4 divisors (see below), whose sum is σ = 12780144. Its totient is φ = 10650100.

The previous prime is 11715107. The next prime is 11715133. The reversal of 11715121 is 12151711.

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 11715121 - 2⁵ = 11715089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11715181) 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, 532495 + ... + 532516.

It is an arithmetic number, because the mean of its divisors is an integer number (3195036).

Almost surely, 2^11715121 is an apocalyptic number.

11715121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11715121 is a deficient number, since it is larger than the sum of its proper divisors (1065023).

11715121 is a wasteful number, since it uses less digits than its factorization.

11715121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065022.

The product of its digits is 70, while the sum is 19.

The square root of 11715121 is about 3422.7358939889. The cubic root of 11715121 is about 227.1166251744.

Adding to 11715121 its reverse (12151711), we get a palindrome (23866832).

The spelling of 11715121 in words is "eleven million, seven hundred fifteen thousand, one hundred twenty-one".