1264731311 has 4 divisors (see below), whose sum is σ = 1266946824. Its totient is φ = 1262515800.

The previous prime is 1264731283. The next prime is 1264731323. The reversal of 1264731311 is 1131374621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1131374621 = 13 ⋅87028817.

It is a cyclic number.

It is not a de Polignac number, because 1264731311 - 2¹⁰ = 1264730287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264731331) 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, 1106900 + ... + 1108041.

It is an arithmetic number, because the mean of its divisors is an integer number (316736706).

Almost surely, 2^1264731311 is an apocalyptic number.

1264731311 is a deficient number, since it is larger than the sum of its proper divisors (2215513).

1264731311 is an equidigital number, since it uses as much as digits as its factorization.

1264731311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2215512.

The product of its digits is 3024, while the sum is 29.

The square root of 1264731311 is about 35563.0610465410. The cubic root of 1264731311 is about 1081.4325157898.

The spelling of 1264731311 in words is "one billion, two hundred sixty-four million, seven hundred thirty-one thousand, three hundred eleven".