1312405155 has 12 divisors (see below), whose sum is σ = 2274835680. Its totient is φ = 699949392.

The previous prime is 1312405153. The next prime is 1312405189. The reversal of 1312405155 is 5515042131.

It is not a de Polignac number, because 1312405155 - 2¹ = 1312405153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1312405153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14582235 + ... + 14582324.

It is an arithmetic number, because the mean of its divisors is an integer number (189569640).

Almost surely, 2^1312405155 is an apocalyptic number.

1312405155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1312405155 is a deficient number, since it is larger than the sum of its proper divisors (962430525).

1312405155 is a wasteful number, since it uses less digits than its factorization.

1312405155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29164570 (or 29164567 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 1312405155 is about 36227.1328564655. The cubic root of 1312405155 is about 1094.8534112895.

Adding to 1312405155 its reverse (5515042131), we get a palindrome (6827447286).

The spelling of 1312405155 in words is "one billion, three hundred twelve million, four hundred five thousand, one hundred fifty-five".