1264545691 has 2 divisors, whose sum is σ = 1264545692. Its totient is φ = 1264545690.

The previous prime is 1264545673. The next prime is 1264545701. The reversal of 1264545691 is 1965454621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1264545691 - 2⁷ = 1264545563 is a prime.

It is not a weakly prime, because it can be changed into another prime (1264545631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632272845 + 632272846.

It is an arithmetic number, because the mean of its divisors is an integer number (632272846).

Almost surely, 2^1264545691 is an apocalyptic number.

1264545691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1264545691 is an equidigital number, since it uses as much as digits as its factorization.

1264545691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 259200, while the sum is 43.

The square root of 1264545691 is about 35560.4512204218. The cubic root of 1264545691 is about 1081.3796072331.

The spelling of 1264545691 in words is "one billion, two hundred sixty-four million, five hundred forty-five thousand, six hundred ninety-one".