1231361216 has 14 divisors (see below), whose sum is σ = 2443482540. Its totient is φ = 615680576.

The previous prime is 1231361213. The next prime is 1231361231. The reversal of 1231361216 is 6121631321.

It is not an unprimeable number, because it can be changed into a prime (1231361213) 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 as a sum of consecutive naturals, namely, 9619946 + ... + 9620073.

Almost surely, 2^1231361216 is an apocalyptic number.

1231361216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1231361216 is a deficient number, since it is larger than the sum of its proper divisors (1212121324).

1231361216 is an equidigital number, since it uses as much as digits as its factorization.

1231361216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19240031 (or 19240021 counting only the distinct ones).

The product of its digits is 1296, while the sum is 26.

The square root of 1231361216 is about 35090.7568456424. The cubic root of 1231361216 is about 1071.8363714016.

Adding to 1231361216 its reverse (6121631321), we get a palindrome (7352992537).

The spelling of 1231361216 in words is "one billion, two hundred thirty-one million, three hundred sixty-one thousand, two hundred sixteen".