1312256145 has 32 divisors (see below), whose sum is σ = 2217341952. Its totient is φ = 661360832.

The previous prime is 1312256131. The next prime is 1312256159. The reversal of 1312256145 is 5416522131.

It is an interprime number because it is at equal distance from previous prime (1312256131) and next prime (1312256159).

It is a cyclic number.

It is not a de Polignac number, because 1312256145 - 2⁶ = 1312256081 is a prime.

It is a super-2 number, since 2×1312256145² = 3444032380180522050, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5722 + ... + 51548.

It is an arithmetic number, because the mean of its divisors is an integer number (69291936).

Almost surely, 2^1312256145 is an apocalyptic number.

1312256145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1312256145 is a deficient number, since it is larger than the sum of its proper divisors (905085807).

1312256145 is a wasteful number, since it uses less digits than its factorization.

1312256145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45941.

The product of its digits is 7200, while the sum is 30.

The square root of 1312256145 is about 36225.0761903961. The cubic root of 1312256145 is about 1094.8119733029.

Adding to 1312256145 its reverse (5416522131), we get a palindrome (6728778276).

The spelling of 1312256145 in words is "one billion, three hundred twelve million, two hundred fifty-six thousand, one hundred forty-five".