1312423155 has 20 divisors (see below), whose sum is σ = 2352640752. Its totient is φ = 699958800.

The previous prime is 1312423139. The next prime is 1312423163. The reversal of 1312423155 is 5513242131.

It is not a de Polignac number, because 1312423155 - 2⁴ = 1312423139 is a prime.

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

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1619871 + ... + 1620680.

Almost surely, 2^1312423155 is an apocalyptic number.

1312423155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1312423155 is a deficient number, since it is larger than the sum of its proper divisors (1040217597).

1312423155 is an equidigital number, since it uses as much as digits as its factorization.

1312423155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3240568 (or 3240559 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 1312423155 is about 36227.3812881914. The cubic root of 1312423155 is about 1094.8584166725.

Adding to 1312423155 its reverse (5513242131), we get a palindrome (6825665286).

The spelling of 1312423155 in words is "one billion, three hundred twelve million, four hundred twenty-three thousand, one hundred fifty-five".