11521985 has 16 divisors (see below), whose sum is σ = 14446992. Its totient is φ = 8812800.

The previous prime is 11521967. The next prime is 11521997. The reversal of 11521985 is 58912511.

It can be written as a sum of positive squares in 8 ways, for example, as 124609 + 11397376 = 353^2 + 3376^2 .

It is not a de Polignac number, because 11521985 - 2⁶ = 11521921 is a prime.

It is a super-2 number, since 2×11521985² = 265512276680450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10775 + ... + 11795.

It is an arithmetic number, because the mean of its divisors is an integer number (902937).

Almost surely, 2^11521985 is an apocalyptic number.

It is an amenable number.

11521985 is a deficient number, since it is larger than the sum of its proper divisors (2925007).

11521985 is a wasteful number, since it uses less digits than its factorization.

11521985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1124.

The product of its digits is 3600, while the sum is 32.

The square root of 11521985 is about 3394.4049552167. The cubic root of 11521985 is about 225.8616181067.

The spelling of 11521985 in words is "eleven million, five hundred twenty-one thousand, nine hundred eighty-five".