1264361863 has 4 divisors (see below), whose sum is σ = 1269652320. Its totient is φ = 1259071408.

The previous prime is 1264361851. The next prime is 1264361867. The reversal of 1264361863 is 3681634621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3681634621 = 7 ⋅525947803.

It is a cyclic number.

It is not a de Polignac number, because 1264361863 - 2²¹ = 1262264711 is a prime.

It is a super-2 number, since 2×1264361863² = 3197221841217661538, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264361867) 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, 2644870 + ... + 2645347.

It is an arithmetic number, because the mean of its divisors is an integer number (317413080).

Almost surely, 2^1264361863 is an apocalyptic number.

1264361863 is a deficient number, since it is larger than the sum of its proper divisors (5290457).

1264361863 is an equidigital number, since it uses as much as digits as its factorization.

1264361863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5290456.

The product of its digits is 124416, while the sum is 40.

The square root of 1264361863 is about 35557.8664011214. The cubic root of 1264361863 is about 1081.3272043595.

The spelling of 1264361863 in words is "one billion, two hundred sixty-four million, three hundred sixty-one thousand, eight hundred sixty-three".