31544230231 has 4 divisors (see below), whose sum is σ = 32396777032. Its totient is φ = 30691683432.

The previous prime is 31544230219. The next prime is 31544230247. The reversal of 31544230231 is 13203244513.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31544230231 - 2⁵ = 31544230199 is a prime.

It is a super-2 number, since 2×31544230231² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31544230231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31544236231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 426273345 + ... + 426273418.

It is an arithmetic number, because the mean of its divisors is an integer number (8099194258).

Almost surely, 2^31544230231 is an apocalyptic number.

31544230231 is a deficient number, since it is larger than the sum of its proper divisors (852546801).

31544230231 is an equidigital number, since it uses as much as digits as its factorization.

31544230231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852546800.

The product of its (nonzero) digits is 8640, while the sum is 28.

Adding to 31544230231 its reverse (13203244513), we get a palindrome (44747474744).

The spelling of 31544230231 in words is "thirty-one billion, five hundred forty-four million, two hundred thirty thousand, two hundred thirty-one".