1321634231 has 2 divisors, whose sum is σ = 1321634232. Its totient is φ = 1321634230.

The previous prime is 1321634183. The next prime is 1321634269. The reversal of 1321634231 is 1324361231.

It is a strong prime.

It is an emirp because it is prime and its reverse (1324361231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1321634231 - 2¹⁰ = 1321633207 is a prime.

It is a super-2 number, since 2×1321634231² = 3493434081101922722, 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 1321634231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321630231) 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, 660817115 + 660817116.

It is an arithmetic number, because the mean of its divisors is an integer number (660817116).

Almost surely, 2^1321634231 is an apocalyptic number.

1321634231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321634231 is an equidigital number, since it uses as much as digits as its factorization.

1321634231 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 1321634231 is about 36354.2876563412. The cubic root of 1321634231 is about 1097.4138228282.

Adding to 1321634231 its reverse (1324361231), we get a palindrome (2645995462).

The spelling of 1321634231 in words is "one billion, three hundred twenty-one million, six hundred thirty-four thousand, two hundred thirty-one".