11701521 has 24 divisors (see below), whose sum is σ = 18398016. Its totient is φ = 7123680.

The previous prime is 11701519. The next prime is 11701531. The reversal of 11701521 is 12510711.

It is a happy number.

It is not a de Polignac number, because 11701521 - 2¹ = 11701519 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11701494 and 11701503.

It is not an unprimeable number, because it can be changed into a prime (11701531) 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, 11566 + ... + 12536.

It is an arithmetic number, because the mean of its divisors is an integer number (766584).

Almost surely, 2^11701521 is an apocalyptic number.

It is an amenable number.

11701521 is a deficient number, since it is larger than the sum of its proper divisors (6696495).

11701521 is a wasteful number, since it uses less digits than its factorization.

11701521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1093 (or 1090 counting only the distinct ones).

The product of its (nonzero) digits is 70, while the sum is 18.

The square root of 11701521 is about 3420.7486022799. The cubic root of 11701521 is about 227.0287051230.

The spelling of 11701521 in words is "eleven million, seven hundred one thousand, five hundred twenty-one".