31544243145 has 12 divisors (see below), whose sum is σ = 54676688196. Its totient is φ = 16823596320.

The previous prime is 31544243141. The next prime is 31544243149. The reversal of 31544243145 is 54134244513.

31544243145 is a `hidden beast` number, since 31 + 5 + 442 + 43 + 145 = 666.

It is an interprime number because it is at equal distance from previous prime (31544243141) and next prime (31544243149).

It can be written as a sum of positive squares in 2 ways, for example, as 7244733456 + 24299509689 = 85116^2 + 155883^2 .

It is not a de Polignac number, because 31544243145 - 2² = 31544243141 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31544243141) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 350491546 + ... + 350491635.

It is an arithmetic number, because the mean of its divisors is an integer number (4556390683).

Almost surely, 2^31544243145 is an apocalyptic number.

It is an amenable number.

31544243145 is a deficient number, since it is larger than the sum of its proper divisors (23132445051).

31544243145 is a wasteful number, since it uses less digits than its factorization.

31544243145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700983192 (or 700983189 counting only the distinct ones).

The product of its digits is 115200, while the sum is 36.

Adding to 31544243145 its reverse (54134244513), we get a palindrome (85678487658).

The spelling of 31544243145 in words is "thirty-one billion, five hundred forty-four million, two hundred forty-three thousand, one hundred forty-five".