11531620 has 12 divisors (see below), whose sum is σ = 24216444. Its totient is φ = 4612640.

The previous prime is 11531617. The next prime is 11531621. The reversal of 11531620 is 2613511.

It can be written as a sum of positive squares in 2 ways, for example, as 6260004 + 5271616 = 2502^2 + 2296^2 .

It is not an unprimeable number, because it can be changed into a prime (11531621) 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, 288271 + ... + 288310.

It is an arithmetic number, because the mean of its divisors is an integer number (2018037).

Almost surely, 2^11531620 is an apocalyptic number.

11531620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11531620 is an abundant number, since it is smaller than the sum of its proper divisors (12684824).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11531620 is a wasteful number, since it uses less digits than its factorization.

11531620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576590 (or 576588 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 11531620 is about 3395.8239059174. The cubic root of 11531620 is about 225.9245577934.

The spelling of 11531620 in words is "eleven million, five hundred thirty-one thousand, six hundred twenty".