12016531 has 8 divisors (see below), whose sum is σ = 12888720. Its totient is φ = 11168352.

The previous prime is 12016507. The next prime is 12016541. The reversal of 12016531 is 13561021.

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

It is not a de Polignac number, because 12016531 - 2¹⁷ = 11885459 is a prime.

It is a super-2 number, since 2×12016531² = 288794034547922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12016499 and 12016508.

It is not an unprimeable number, because it can be changed into a prime (12016541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4960 + ... + 6973.

It is an arithmetic number, because the mean of its divisors is an integer number (1611090).

Almost surely, 2^12016531 is an apocalyptic number.

12016531 is a deficient number, since it is larger than the sum of its proper divisors (872189).

12016531 is a wasteful number, since it uses less digits than its factorization.

12016531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12005.

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

The square root of 12016531 is about 3466.4868382845. The cubic root of 12016531 is about 229.0479295569.

Adding to 12016531 its reverse (13561021), we get a palindrome (25577552).

The spelling of 12016531 in words is "twelve million, sixteen thousand, five hundred thirty-one".