1209264191 has 2 divisors, whose sum is σ = 1209264192. Its totient is φ = 1209264190.

The previous prime is 1209264181. The next prime is 1209264197. The reversal of 1209264191 is 1914629021.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1209264191 - 2¹⁴ = 1209247807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1209264197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 604632095 + 604632096.

It is an arithmetic number, because the mean of its divisors is an integer number (604632096).

Almost surely, 2^1209264191 is an apocalyptic number.

1209264191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209264191 is an equidigital number, since it uses as much as digits as its factorization.

1209264191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 1209264191 is about 34774.4761427113. The cubic root of 1209264191 is about 1065.3861930463.

The spelling of 1209264191 in words is "one billion, two hundred nine million, two hundred sixty-four thousand, one hundred ninety-one".