11531983 has 6 divisors (see below), whose sum is σ = 11655744. Its totient is φ = 11409516.

The previous prime is 11531977. The next prime is 11531987. The reversal of 11531983 is 38913511.

It is not a de Polignac number, because 11531983 - 2⁵ = 11531951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11531987) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10066 + ... + 11152.

It is an arithmetic number, because the mean of its divisors is an integer number (1942624).

Almost surely, 2^11531983 is an apocalyptic number.

11531983 is a deficient number, since it is larger than the sum of its proper divisors (123761).

11531983 is an equidigital number, since it uses as much as digits as its factorization.

11531983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1293 (or 1190 counting only the distinct ones).

The product of its digits is 3240, while the sum is 31.

The square root of 11531983 is about 3395.8773534979. The cubic root of 11531983 is about 225.9269283697.

It can be divided in two parts, 1153 and 1983, that added together give a square (3136 = 56²).

The spelling of 11531983 in words is "eleven million, five hundred thirty-one thousand, nine hundred eighty-three".