31200242243 has 4 divisors (see below), whose sum is σ = 31491833400. Its totient is φ = 30908651088.

The previous prime is 31200242221. The next prime is 31200242261. The reversal of 31200242243 is 34224200213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34224200213 = 7 ⋅4889171459.

It is a cyclic number.

It is not a de Polignac number, because 31200242243 - 2⁶ = 31200242179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31200242543) 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 3 ways as a sum of consecutive naturals, for example, 145795418 + ... + 145795631.

It is an arithmetic number, because the mean of its divisors is an integer number (7872958350).

Almost surely, 2^31200242243 is an apocalyptic number.

31200242243 is a deficient number, since it is larger than the sum of its proper divisors (291591157).

31200242243 is a wasteful number, since it uses less digits than its factorization.

31200242243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291591156.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 31200242243 its reverse (34224200213), we get a palindrome (65424442456).

The spelling of 31200242243 in words is "thirty-one billion, two hundred million, two hundred forty-two thousand, two hundred forty-three".