1311643545 has 16 divisors (see below), whose sum is σ = 2117204352. Its totient is φ = 693351680.

The previous prime is 1311643537. The next prime is 1311643583. The reversal of 1311643545 is 5453461131.

It is a happy number.

It is not a de Polignac number, because 1311643545 - 2³ = 1311643537 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 385221 + ... + 388610.

It is an arithmetic number, because the mean of its divisors is an integer number (132325272).

Almost surely, 2^1311643545 is an apocalyptic number.

1311643545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1311643545 is a deficient number, since it is larger than the sum of its proper divisors (805560807).

1311643545 is a wasteful number, since it uses less digits than its factorization.

1311643545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773952.

The product of its digits is 21600, while the sum is 33.

The square root of 1311643545 is about 36216.6197345915. The cubic root of 1311643545 is about 1094.6415832437.

The spelling of 1311643545 in words is "one billion, three hundred eleven million, six hundred forty-three thousand, five hundred forty-five".