31445445443131 has 4 divisors (see below), whose sum is σ = 31445472455752. Its totient is φ = 31445418430512.

The previous prime is 31445445443129. The next prime is 31445445443171. The reversal of 31445445443131 is 13134454454413.

It is a happy number.

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 31445445443131 - 2¹ = 31445445443129 is a prime.

It is a super-2 number, since 2×31445445443131² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31445445443101) 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, 11677626 + ... + 14115871.

It is an arithmetic number, because the mean of its divisors is an integer number (7861368113938).

Almost surely, 2^{31445445443131} is an apocalyptic number.

31445445443131 is a deficient number, since it is larger than the sum of its proper divisors (27012621).

31445445443131 is a wasteful number, since it uses less digits than its factorization.

31445445443131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27012620.

The product of its digits is 2764800, while the sum is 46.

Adding to 31445445443131 its reverse (13134454454413), we get a palindrome (44579899897544).

The spelling of 31445445443131 in words is "thirty-one trillion, four hundred forty-five billion, four hundred forty-five million, four hundred forty-three thousand, one hundred thirty-one".