31544421133 has 4 divisors (see below), whose sum is σ = 32915917728. Its totient is φ = 30172924540.

The previous prime is 31544421109. The next prime is 31544421137. The reversal of 31544421133 is 33112444513.

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: 33112444513 = 1031 ⋅32116823.

It is a cyclic number.

It is not a de Polignac number, because 31544421133 - 2¹³ = 31544412941 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31544421095 and 31544421104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31544421137) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 685748263 + ... + 685748308.

It is an arithmetic number, because the mean of its divisors is an integer number (8228979432).

Almost surely, 2^31544421133 is an apocalyptic number.

It is an amenable number.

31544421133 is a deficient number, since it is larger than the sum of its proper divisors (1371496595).

31544421133 is a wasteful number, since it uses less digits than its factorization.

31544421133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1371496594.

The product of its digits is 17280, while the sum is 31.

Adding to 31544421133 its reverse (33112444513), we get a palindrome (64656865646).

The spelling of 31544421133 in words is "thirty-one billion, five hundred forty-four million, four hundred twenty-one thousand, one hundred thirty-three".