31145202243 has 16 divisors (see below), whose sum is σ = 46187360160. Its totient is φ = 20742624288.

The previous prime is 31145202191. The next prime is 31145202281. The reversal of 31145202243 is 34220254113.

31145202243 is a `hidden beast` number, since 3 + 114 + 520 + 2 + 24 + 3 = 666.

It is not a de Polignac number, because 31145202243 - 2²⁶ = 31078093379 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (31145202043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 551580 + ... + 605417.

It is an arithmetic number, because the mean of its divisors is an integer number (2886710010).

Almost surely, 2^31145202243 is an apocalyptic number.

31145202243 is a deficient number, since it is larger than the sum of its proper divisors (15042157917).

31145202243 is a wasteful number, since it uses less digits than its factorization.

31145202243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1158003 (or 1157997 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 31145202243 its reverse (34220254113), we get a palindrome (65365456356).

The spelling of 31145202243 in words is "thirty-one billion, one hundred forty-five million, two hundred two thousand, two hundred forty-three".