1209985331 has 2 divisors, whose sum is σ = 1209985332. Its totient is φ = 1209985330.

The previous prime is 1209985327. The next prime is 1209985339. The reversal of 1209985331 is 1335899021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1209985331 - 2² = 1209985327 is a prime.

It is a super-2 number, since 2×1209985331² = 2928129002470359122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1209985339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 604992665 + 604992666.

It is an arithmetic number, because the mean of its divisors is an integer number (604992666).

Almost surely, 2^1209985331 is an apocalyptic number.

1209985331 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209985331 is an equidigital number, since it uses as much as digits as its factorization.

1209985331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 1209985331 is about 34784.8434091631. The cubic root of 1209985331 is about 1065.5979306007.

The spelling of 1209985331 in words is "one billion, two hundred nine million, nine hundred eighty-five thousand, three hundred thirty-one".