31242220004 has 6 divisors (see below), whose sum is σ = 54673885014. Its totient is φ = 15621110000.

The previous prime is 31242220003. The next prime is 31242220007. The reversal of 31242220004 is 40002224213.

It can be written as a sum of positive squares in only one way, i.e., 23135018404 + 8107201600 = 152102^2 + 90040^2 .

It is not an unprimeable number, because it can be changed into a prime (31242220003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3905277497 + ... + 3905277504.

It is an arithmetic number, because the mean of its divisors is an integer number (9112314169).

Almost surely, 2^31242220004 is an apocalyptic number.

It is an amenable number.

31242220004 is a deficient number, since it is larger than the sum of its proper divisors (23431665010).

31242220004 is a wasteful number, since it uses less digits than its factorization.

31242220004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7810555005 (or 7810555003 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 31242220004 its reverse (40002224213), we get a palindrome (71244444217).

The spelling of 31242220004 in words is "thirty-one billion, two hundred forty-two million, two hundred twenty thousand, four".