1209926831 has 2 divisors, whose sum is σ = 1209926832. Its totient is φ = 1209926830.

The previous prime is 1209926779. The next prime is 1209926849. The reversal of 1209926831 is 1386299021.

It is a strong prime.

It is an emirp because it is prime and its reverse (1386299021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1209926831 - 2¹⁰ = 1209925807 is a prime.

It is a super-2 number, since 2×1209926831² = 2927845872747405122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1209926231) 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, 604963415 + 604963416.

It is an arithmetic number, because the mean of its divisors is an integer number (604963416).

Almost surely, 2^1209926831 is an apocalyptic number.

1209926831 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209926831 is an equidigital number, since it uses as much as digits as its factorization.

1209926831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 1209926831 is about 34784.0025155243. The cubic root of 1209926831 is about 1065.5807572565.

The spelling of 1209926831 in words is "one billion, two hundred nine million, nine hundred twenty-six thousand, eight hundred thirty-one".