11521623 has 4 divisors (see below), whose sum is σ = 15362168. Its totient is φ = 7681080.

The previous prime is 11521607. The next prime is 11521633. The reversal of 11521623 is 32612511.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 11521623 - 2⁴ = 11521607 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11521623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11521603) 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, 1920268 + ... + 1920273.

It is an arithmetic number, because the mean of its divisors is an integer number (3840542).

Almost surely, 2^11521623 is an apocalyptic number.

11521623 is a deficient number, since it is larger than the sum of its proper divisors (3840545).

11521623 is an equidigital number, since it uses as much as digits as its factorization.

11521623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3840544.

The product of its digits is 360, while the sum is 21.

The square root of 11521623 is about 3394.3516317553. The cubic root of 11521623 is about 225.8592526936.

It can be divided in two parts, 1152 and 1623, that added together give a triangular number (2775 = T₇₄).

The spelling of 11521623 in words is "eleven million, five hundred twenty-one thousand, six hundred twenty-three".