1264371813 has 12 divisors (see below), whose sum is σ = 1843384608. Its totient is φ = 835036200.

The previous prime is 1264371811. The next prime is 1264371883. The reversal of 1264371813 is 3181734621.

It is a happy number.

1264371813 is a `hidden beast` number, since 1 + 2 + 643 + 7 + 1 + 8 + 1 + 3 = 666.

It is not a de Polignac number, because 1264371813 - 2¹ = 1264371811 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264371811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 655513 + ... + 657438.

It is an arithmetic number, because the mean of its divisors is an integer number (153615384).

Almost surely, 2^1264371813 is an apocalyptic number.

It is an amenable number.

1264371813 is a deficient number, since it is larger than the sum of its proper divisors (579012795).

1264371813 is a wasteful number, since it uses less digits than its factorization.

1264371813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1313064 (or 1313061 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 1264371813 is about 35558.0063136279. The cubic root of 1264371813 is about 1081.3300408833.

The spelling of 1264371813 in words is "one billion, two hundred sixty-four million, three hundred seventy-one thousand, eight hundred thirteen".