1231344255015 has 24 divisors (see below), whose sum is σ = 2439234334368. Its totient is φ = 562900230720.

The previous prime is 1231344255013. The next prime is 1231344255077. The reversal of 1231344255015 is 5105524431321.

1231344255015 is a `hidden beast` number, since 1 + 2 + 31 + 34 + 42 + 550 + 1 + 5 = 666.

It is not a de Polignac number, because 1231344255015 - 2¹ = 1231344255013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231344255013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1954514376 + ... + 1954515005.

It is an arithmetic number, because the mean of its divisors is an integer number (101634763932).

Almost surely, 2^{1231344255015} is an apocalyptic number.

1231344255015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1231344255015 is a deficient number, since it is larger than the sum of its proper divisors (1207890079353).

1231344255015 is a wasteful number, since it uses less digits than its factorization.

1231344255015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3909029399 (or 3909029396 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

Adding to 1231344255015 its reverse (5105524431321), we get a palindrome (6336868686336).

The spelling of 1231344255015 in words is "one trillion, two hundred thirty-one billion, three hundred forty-four million, two hundred fifty-five thousand, fifteen".