1311254405 has 4 divisors (see below), whose sum is σ = 1573505292. Its totient is φ = 1049003520.

The previous prime is 1311254389. The next prime is 1311254407. The reversal of 1311254405 is 5044521131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5044521131 = 13 ⋅388040087.

It can be written as a sum of positive squares in 2 ways, for example, as 1027971844 + 283282561 = 32062^2 + 16831^2 .

It is not a de Polignac number, because 1311254405 - 2⁴ = 1311254389 is a prime.

It is a super-2 number, since 2×1311254405² = 3438776229263808050, 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 (1311254407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131125436 + ... + 131125445.

It is an arithmetic number, because the mean of its divisors is an integer number (393376323).

Almost surely, 2^1311254405 is an apocalyptic number.

It is an amenable number.

1311254405 is a deficient number, since it is larger than the sum of its proper divisors (262250887).

1311254405 is an equidigital number, since it uses as much as digits as its factorization.

1311254405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262250886.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 1311254405 is about 36211.2469406951. The cubic root of 1311254405 is about 1094.5333193383.

Adding to 1311254405 its reverse (5044521131), we get a palindrome (6355775536).

The spelling of 1311254405 in words is "one billion, three hundred eleven million, two hundred fifty-four thousand, four hundred five".