11651521 has 8 divisors (see below), whose sum is σ = 13336704. Its totient is φ = 9971520.

The previous prime is 11651509. The next prime is 11651537. The reversal of 11651521 is 12515611.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11651521 - 2²³ = 3262913 is a prime.

It is a super-2 number, since 2×11651521² = 271515883226882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11651492 and 11651501.

It is not an unprimeable number, because it can be changed into a prime (11651561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7881 + ... + 9241.

It is an arithmetic number, because the mean of its divisors is an integer number (1667088).

Almost surely, 2^11651521 is an apocalyptic number.

It is an amenable number.

11651521 is a deficient number, since it is larger than the sum of its proper divisors (1685183).

11651521 is a wasteful number, since it uses less digits than its factorization.

11651521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2591.

The product of its digits is 300, while the sum is 22.

The square root of 11651521 is about 3413.4324367123. The cubic root of 11651521 is about 226.7048827817.

The spelling of 11651521 in words is "eleven million, six hundred fifty-one thousand, five hundred twenty-one".