11531816 has 16 divisors (see below), whose sum is σ = 21738240. Its totient is φ = 5734960.

The previous prime is 11531801. The next prime is 11531837. The reversal of 11531816 is 61813511.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2246 + ... + 5301.

It is an arithmetic number, because the mean of its divisors is an integer number (1358640).

Almost surely, 2^11531816 is an apocalyptic number.

It is an amenable number.

11531816 is a deficient number, since it is larger than the sum of its proper divisors (10206424).

11531816 is a wasteful number, since it uses less digits than its factorization.

11531816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7744 (or 7740 counting only the distinct ones).

The product of its digits is 720, while the sum is 26.

The square root of 11531816 is about 3395.8527647706. The cubic root of 11531816 is about 225.9258377802.

The spelling of 11531816 in words is "eleven million, five hundred thirty-one thousand, eight hundred sixteen".