31444021311 has 4 divisors (see below), whose sum is σ = 41925361752. Its totient is φ = 20962680872.

The previous prime is 31444021289. The next prime is 31444021361. The reversal of 31444021311 is 11312044413.

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 31444021311 - 2⁶ = 31444021247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31444021361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5240670216 + ... + 5240670221.

It is an arithmetic number, because the mean of its divisors is an integer number (10481340438).

Almost surely, 2^31444021311 is an apocalyptic number.

31444021311 is a deficient number, since it is larger than the sum of its proper divisors (10481340441).

31444021311 is a wasteful number, since it uses less digits than its factorization.

31444021311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10481340440.

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 31444021311 its reverse (11312044413), we get a palindrome (42756065724).

The spelling of 31444021311 in words is "thirty-one billion, four hundred forty-four million, twenty-one thousand, three hundred eleven".