11457521 has 4 divisors (see below), whose sum is σ = 11465844. Its totient is φ = 11449200.

The previous prime is 11457499. The next prime is 11457533. The reversal of 11457521 is 12575411.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 829921 + 10627600 = 911^2 + 3260^2 .

It is a cyclic number.

It is not a de Polignac number, because 11457521 - 2¹⁸ = 11195377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11457571) 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, 1550 + ... + 5031.

It is an arithmetic number, because the mean of its divisors is an integer number (2866461).

Almost surely, 2^11457521 is an apocalyptic number.

It is an amenable number.

11457521 is a deficient number, since it is larger than the sum of its proper divisors (8323).

11457521 is an equidigital number, since it uses as much as digits as its factorization.

11457521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8322.

The product of its digits is 1400, while the sum is 26.

The square root of 11457521 is about 3384.8960102195. The cubic root of 11457521 is about 225.4396080183.

The spelling of 11457521 in words is "eleven million, four hundred fifty-seven thousand, five hundred twenty-one".