1209620231 has 2 divisors, whose sum is σ = 1209620232. Its totient is φ = 1209620230.

The previous prime is 1209620221. The next prime is 1209620233. The reversal of 1209620231 is 1320269021.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1209620231 is a prime.

It is a super-2 number, since 2×1209620231² = 2926362206488986722, which contains 22 as substring.

Together with 1209620233, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1209620231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1209620233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 604810115 + 604810116.

It is an arithmetic number, because the mean of its divisors is an integer number (604810116).

Almost surely, 2^1209620231 is an apocalyptic number.

1209620231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209620231 is an equidigital number, since it uses as much as digits as its factorization.

1209620231 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1209620231 is about 34779.5950378954. The cubic root of 1209620231 is about 1065.4907422650.

Adding to 1209620231 its reverse (1320269021), we get a palindrome (2529889252).

The spelling of 1209620231 in words is "one billion, two hundred nine million, six hundred twenty thousand, two hundred thirty-one".