1264230809 has 4 divisors (see below), whose sum is σ = 1305012480. Its totient is φ = 1223449140.

The previous prime is 1264230767. The next prime is 1264230817. The reversal of 1264230809 is 9080324621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9080324621 = 31159 ⋅291419.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1264230809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1264230829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20390789 + ... + 20390850.

It is an arithmetic number, because the mean of its divisors is an integer number (326253120).

Almost surely, 2^1264230809 is an apocalyptic number.

It is an amenable number.

1264230809 is a deficient number, since it is larger than the sum of its proper divisors (40781671).

1264230809 is an equidigital number, since it uses as much as digits as its factorization.

1264230809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40781670.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 1264230809 is about 35556.0235262606. The cubic root of 1264230809 is about 1081.2898423890.

The spelling of 1264230809 in words is "one billion, two hundred sixty-four million, two hundred thirty thousand, eight hundred nine".