1311555845 has 8 divisors (see below), whose sum is σ = 1656702240. Its totient is φ = 994021200.

The previous prime is 1311555829. The next prime is 1311555851. The reversal of 1311555845 is 5485551131.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1311555845 - 2⁴ = 1311555829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1311555799 and 1311555808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6902831 + ... + 6903020.

It is an arithmetic number, because the mean of its divisors is an integer number (207087780).

Almost surely, 2^1311555845 is an apocalyptic number.

It is an amenable number.

1311555845 is a deficient number, since it is larger than the sum of its proper divisors (345146395).

1311555845 is a wasteful number, since it uses less digits than its factorization.

1311555845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13805875.

The product of its digits is 60000, while the sum is 38.

The square root of 1311555845 is about 36215.4089442602. The cubic root of 1311555845 is about 1094.6171858107.

The spelling of 1311555845 in words is "one billion, three hundred eleven million, five hundred fifty-five thousand, eight hundred forty-five".