1209201131 has 2 divisors, whose sum is σ = 1209201132. Its totient is φ = 1209201130.

The previous prime is 1209201083. The next prime is 1209201137. The reversal of 1209201131 is 1311029021.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1209201131 - 2⁶ = 1209201067 is a prime.

It is a super-3 number, since 3×1209201131³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (1209201137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 604600565 + 604600566.

It is an arithmetic number, because the mean of its divisors is an integer number (604600566).

Almost surely, 2^1209201131 is an apocalyptic number.

1209201131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209201131 is an equidigital number, since it uses as much as digits as its factorization.

1209201131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 1209201131 is about 34773.5694313943. The cubic root of 1209201131 is about 1065.3676736796.

The spelling of 1209201131 in words is "one billion, two hundred nine million, two hundred one thousand, one hundred thirty-one".