11661572 has 12 divisors (see below), whose sum is σ = 21977676. Its totient is φ = 5382240.

The previous prime is 11661571. The next prime is 11661607. The reversal of 11661572 is 27516611.

It can be written as a sum of positive squares in 2 ways, for example, as 678976 + 10982596 = 824^2 + 3314^2 .

It is a super-2 number, since 2×11661572² = 271984523022368, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11661571) 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, 112079 + ... + 112182.

It is an arithmetic number, because the mean of its divisors is an integer number (1831473).

Almost surely, 2^11661572 is an apocalyptic number.

It is an amenable number.

11661572 is a deficient number, since it is larger than the sum of its proper divisors (10316104).

11661572 is a wasteful number, since it uses less digits than its factorization.

11661572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224278 (or 224276 counting only the distinct ones).

The product of its digits is 2520, while the sum is 29.

The square root of 11661572 is about 3414.9043910482. The cubic root of 11661572 is about 226.7700518381.

The spelling of 11661572 in words is "eleven million, six hundred sixty-one thousand, five hundred seventy-two".