1311555105 has 64 divisors (see below), whose sum is σ = 2780651520. Its totient is φ = 573490368.

The previous prime is 1311555019. The next prime is 1311555107. The reversal of 1311555105 is 5015551131.

1311555105 is a `hidden beast` number, since 1 + 3 + 1 + 1 + 555 + 105 = 666.

It is not a de Polignac number, because 1311555105 - 2⁷ = 1311554977 is a prime.

It is a super-2 number, since 2×1311555105² = 3440353586903122050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1311555107) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8437 + ... + 51906.

It is an arithmetic number, because the mean of its divisors is an integer number (43447680).

Almost surely, 2^1311555105 is an apocalyptic number.

1311555105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1311555105 is an abundant number, since it is smaller than the sum of its proper divisors (1469096415).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1311555105 is a wasteful number, since it uses less digits than its factorization.

1311555105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60387 (or 60381 counting only the distinct ones).

The product of its (nonzero) digits is 1875, while the sum is 27.

The square root of 1311555105 is about 36215.3987276131. The cubic root of 1311555105 is about 1094.6169799441.

The spelling of 1311555105 in words is "one billion, three hundred eleven million, five hundred fifty-five thousand, one hundred five".