11531530 has 8 divisors (see below), whose sum is σ = 20756772. Its totient is φ = 4612608.

The previous prime is 11531521. The next prime is 11531539. The reversal of 11531530 is 3513511.

It is an interprime number because it is at equal distance from previous prime (11531521) and next prime (11531539).

It can be written as a sum of positive squares in 2 ways, for example, as 10751841 + 779689 = 3279^2 + 883^2 .

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

It is a zygodrome in base 4.

It is a junction number, because it is equal to n+sod(n) for n = 11531498 and 11531507.

It is not an unprimeable number, because it can be changed into a prime (11531539) 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, 576567 + ... + 576586.

Almost surely, 2^11531530 is an apocalyptic number.

11531530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11531530 is a deficient number, since it is larger than the sum of its proper divisors (9225242).

11531530 is a wasteful number, since it uses less digits than its factorization.

11531530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1153160.

The product of its (nonzero) digits is 225, while the sum is 19.

The square root of 11531530 is about 3395.8106543210. The cubic root of 11531530 is about 225.9239700396.

The spelling of 11531530 in words is "eleven million, five hundred thirty-one thousand, five hundred thirty".