1312145555 has 16 divisors (see below), whose sum is σ = 1810983360. Its totient is φ = 894022272.

The previous prime is 1312145551. The next prime is 1312145609. The reversal of 1312145555 is 5555412131.

It is a cyclic number.

It is not a de Polignac number, because 1312145555 - 2² = 1312145551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1312145551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113900 + ... + 124889.

It is an arithmetic number, because the mean of its divisors is an integer number (113186460).

Almost surely, 2^1312145555 is an apocalyptic number.

1312145555 is a deficient number, since it is larger than the sum of its proper divisors (498837805).

1312145555 is a wasteful number, since it uses less digits than its factorization.

1312145555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238958.

The product of its digits is 15000, while the sum is 32.

The square root of 1312145555 is about 36223.5497294233. The cubic root of 1312145555 is about 1094.7812174534.

Adding to 1312145555 its reverse (5555412131), we get a palindrome (6867557686).

The spelling of 1312145555 in words is "one billion, three hundred twelve million, one hundred forty-five thousand, five hundred fifty-five".