1216325231 has 16 divisors (see below), whose sum is σ = 1410475680. Its totient is φ = 1036615680.

The previous prime is 1216325203. The next prime is 1216325237. The reversal of 1216325231 is 1325236121.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1216325231 is a prime.

It is a super-2 number, since 2×1216325231² = 2958894135134406722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1216325231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216325237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35405 + ... + 60713.

It is an arithmetic number, because the mean of its divisors is an integer number (88154730).

Almost surely, 2^1216325231 is an apocalyptic number.

1216325231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1216325231 is a deficient number, since it is larger than the sum of its proper divisors (194150449).

1216325231 is a wasteful number, since it uses less digits than its factorization.

1216325231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25594.

The product of its digits is 2160, while the sum is 26.

The square root of 1216325231 is about 34875.8545558385. The cubic root of 1216325231 is about 1067.4558096617.

The spelling of 1216325231 in words is "one billion, two hundred sixteen million, three hundred twenty-five thousand, two hundred thirty-one".