31442140013 has 4 divisors (see below), whose sum is σ = 31442844288. Its totient is φ = 31441435740.

The previous prime is 31442140003. The next prime is 31442140027. The reversal of 31442140013 is 31004124413.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31004124413 = 4337 ⋅7148749.

It is a cyclic number.

It is not a de Polignac number, because 31442140013 - 2⁴ = 31442139997 is a prime.

It is a super-4 number, since 4×31442140013⁴ (a number of 43 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31442140003) 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, 280283 + ... + 376088.

It is an arithmetic number, because the mean of its divisors is an integer number (7860711072).

Almost surely, 2^31442140013 is an apocalyptic number.

It is an amenable number.

31442140013 is a deficient number, since it is larger than the sum of its proper divisors (704275).

31442140013 is an equidigital number, since it uses as much as digits as its factorization.

31442140013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704274.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 31442140013 its reverse (31004124413), we get a palindrome (62446264426).

The spelling of 31442140013 in words is "thirty-one billion, four hundred forty-two million, one hundred forty thousand, thirteen".