1233216531 has 12 divisors (see below), whose sum is σ = 1791156640. Its totient is φ = 817601040.

The previous prime is 1233216511. The next prime is 1233216563. The reversal of 1233216531 is 1356123321.

1233216531 is a `hidden beast` number, since 1 + 2 + 3 + 3 + 2 + 1 + 653 + 1 = 666.

It is not a de Polignac number, because 1233216531 - 2⁷ = 1233216403 is a prime.

It is a super-2 number, since 2×1233216531² = 3041646024663347922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1233216495 and 1233216504.

It is not an unprimeable number, because it can be changed into a prime (1233216511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 376891 + ... + 380148.

Almost surely, 2^1233216531 is an apocalyptic number.

1233216531 is a deficient number, since it is larger than the sum of its proper divisors (557940109).

1233216531 is a wasteful number, since it uses less digits than its factorization.

1233216531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 757226 (or 757223 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 1233216531 is about 35117.1828454391. The cubic root of 1233216531 is about 1072.3744199060.

Adding to 1233216531 its reverse (1356123321), we get a palindrome (2589339852).

The spelling of 1233216531 in words is "one billion, two hundred thirty-three million, two hundred sixteen thousand, five hundred thirty-one".