31223223142 has 4 divisors (see below), whose sum is σ = 46834834716. Its totient is φ = 15611611570.

The previous prime is 31223223071. The next prime is 31223223169. The reversal of 31223223142 is 24132232213.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7805805784 + ... + 7805805787.

It is an arithmetic number, because the mean of its divisors is an integer number (11708708679).

Almost surely, 2^31223223142 is an apocalyptic number.

31223223142 is a deficient number, since it is larger than the sum of its proper divisors (15611611574).

31223223142 is a wasteful number, since it uses less digits than its factorization.

31223223142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15611611573.

The product of its digits is 3456, while the sum is 25.

Adding to 31223223142 its reverse (24132232213), we get a palindrome (55355455355).

The spelling of 31223223142 in words is "thirty-one billion, two hundred twenty-three million, two hundred twenty-three thousand, one hundred forty-two".