31442240131 has 4 divisors (see below), whose sum is σ = 31443319600. Its totient is φ = 31441160664.

The previous prime is 31442240113. The next prime is 31442240143. The reversal of 31442240131 is 13104224413.

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 31442240131 - 2¹³ = 31442231939 is a prime.

It is a super-2 number, since 2×31442240131² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31442240096 and 31442240105.

It is not an unprimeable number, because it can be changed into a prime (31442244131) 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, 494796 + ... + 554713.

It is an arithmetic number, because the mean of its divisors is an integer number (7860829900).

Almost surely, 2^31442240131 is an apocalyptic number.

31442240131 is a deficient number, since it is larger than the sum of its proper divisors (1079469).

31442240131 is a wasteful number, since it uses less digits than its factorization.

31442240131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1079468.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 31442240131 its reverse (13104224413), we get a palindrome (44546464544).

The spelling of 31442240131 in words is "thirty-one billion, four hundred forty-two million, two hundred forty thousand, one hundred thirty-one".