31304320442 has 4 divisors (see below), whose sum is σ = 46956480666. Its totient is φ = 15652160220.

The previous prime is 31304320429. The next prime is 31304320493. The reversal of 31304320442 is 24402340313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24402340313 = 13 ⋅1877103101.

It can be written as a sum of positive squares in only one way, i.e., 30359926081 + 944394361 = 174241^2 + 30731^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7826080109 + ... + 7826080112.

Almost surely, 2^31304320442 is an apocalyptic number.

31304320442 is a deficient number, since it is larger than the sum of its proper divisors (15652160224).

31304320442 is a wasteful number, since it uses less digits than its factorization.

31304320442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15652160223.

The product of its (nonzero) digits is 6912, while the sum is 26.

Adding to 31304320442 its reverse (24402340313), we get a palindrome (55706660755).

The spelling of 31304320442 in words is "thirty-one billion, three hundred four million, three hundred twenty thousand, four hundred forty-two".