1311045959 has 4 divisors (see below), whose sum is σ = 1311257304. Its totient is φ = 1310834616.

The previous prime is 1311045947. The next prime is 1311045973. The reversal of 1311045959 is 9595401131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9595401131 = 2699 ⋅3555169.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311045959 is a prime.

It is a super-2 number, since 2×1311045959² = 3437683013220459362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311045919) 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, 96077 + ... + 108870.

It is an arithmetic number, because the mean of its divisors is an integer number (327814326).

Almost surely, 2^1311045959 is an apocalyptic number.

1311045959 is a deficient number, since it is larger than the sum of its proper divisors (211345).

1311045959 is an equidigital number, since it uses as much as digits as its factorization.

1311045959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211344.

The product of its (nonzero) digits is 24300, while the sum is 38.

The square root of 1311045959 is about 36208.3686321270. The cubic root of 1311045959 is about 1094.4753180885.

The spelling of 1311045959 in words is "one billion, three hundred eleven million, forty-five thousand, nine hundred fifty-nine".