11511975 has 24 divisors (see below), whose sum is σ = 20154960. Its totient is φ = 5777920.

The previous prime is 11511961. The next prime is 11511977. The reversal of 11511975 is 57911511.

It is not a de Polignac number, because 11511975 - 2¹² = 11507879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11511977) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3240 + ... + 5789.

It is an arithmetic number, because the mean of its divisors is an integer number (839790).

Almost surely, 2^11511975 is an apocalyptic number.

11511975 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11511975 is a deficient number, since it is larger than the sum of its proper divisors (8642985).

11511975 is a wasteful number, since it uses less digits than its factorization.

11511975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9059 (or 9054 counting only the distinct ones).

The product of its digits is 1575, while the sum is 30.

The square root of 11511975 is about 3392.9301495905. The cubic root of 11511975 is about 225.7961915955.

It can be divided in two parts, 115 and 11975, that added together give a triangular number (12090 = T₁₅₅).

The spelling of 11511975 in words is "eleven million, five hundred eleven thousand, nine hundred seventy-five".