1231344040145 has 16 divisors (see below), whose sum is σ = 1487604666240. Its totient is φ = 978421555584.

The previous prime is 1231344040141. The next prime is 1231344040153. The reversal of 1231344040145 is 5410404431321.

It is a cyclic number.

It is not a de Polignac number, because 1231344040145 - 2² = 1231344040141 is a prime.

It is a super-2 number, since 2×1231344040145² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1231344040141) 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, 839621 + ... + 1779789.

It is an arithmetic number, because the mean of its divisors is an integer number (92975291640).

Almost surely, 2^{1231344040145} is an apocalyptic number.

It is an amenable number.

1231344040145 is a deficient number, since it is larger than the sum of its proper divisors (256260626095).

1231344040145 is a wasteful number, since it uses less digits than its factorization.

1231344040145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 941944.

The product of its (nonzero) digits is 23040, while the sum is 32.

Adding to 1231344040145 its reverse (5410404431321), we get a palindrome (6641748471466).

The spelling of 1231344040145 in words is "one trillion, two hundred thirty-one billion, three hundred forty-four million, forty thousand, one hundred forty-five".