1216332431 has 2 divisors, whose sum is σ = 1216332432. Its totient is φ = 1216332430.

The previous prime is 1216332419. The next prime is 1216332479. The reversal of 1216332431 is 1342336121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1216332431 - 2¹⁴ = 1216316047 is a prime.

It is a super-2 number, since 2×1216332431² = 2958929165404739522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1216332431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216332401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608166215 + 608166216.

It is an arithmetic number, because the mean of its divisors is an integer number (608166216).

Almost surely, 2^1216332431 is an apocalyptic number.

1216332431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216332431 is an equidigital number, since it uses as much as digits as its factorization.

1216332431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 26.

The square root of 1216332431 is about 34875.9577789629. The cubic root of 1216332431 is about 1067.4579159148.

Adding to 1216332431 its reverse (1342336121), we get a palindrome (2558668552).

The spelling of 1216332431 in words is "one billion, two hundred sixteen million, three hundred thirty-two thousand, four hundred thirty-one".