1264375643 has 4 divisors (see below), whose sum is σ = 1264508688. Its totient is φ = 1264242600.

The previous prime is 1264375633. The next prime is 1264375661. The reversal of 1264375643 is 3465734621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1264375643 - 2⁴ = 1264375627 is a prime.

It is a super-2 number, since 2×1264375643² = 3197291533223326898, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1264375643.

It is not an unprimeable number, because it can be changed into a prime (1264375633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51071 + ... + 71672.

It is an arithmetic number, because the mean of its divisors is an integer number (316127172).

Almost surely, 2^1264375643 is an apocalyptic number.

1264375643 is a deficient number, since it is larger than the sum of its proper divisors (133045).

1264375643 is a wasteful number, since it uses less digits than its factorization.

1264375643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133044.

The product of its digits is 362880, while the sum is 41.

The square root of 1264375643 is about 35558.0601692500. The cubic root of 1264375643 is about 1081.3311327272.

The spelling of 1264375643 in words is "one billion, two hundred sixty-four million, three hundred seventy-five thousand, six hundred forty-three".