31544351223431 has 4 divisors (see below), whose sum is σ = 31544512579272. Its totient is φ = 31544189867592.

The previous prime is 31544351223377. The next prime is 31544351223449. The reversal of 31544351223431 is 13432215344513.

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 31544351223431 - 2⁶ = 31544351223367 is a prime.

It is a super-2 number, since 2×31544351223431² (a number of 28 digits) contains 22 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 (31544351223461) 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, 80384321 + ... + 80775786.

It is an arithmetic number, because the mean of its divisors is an integer number (7886128144818).

Almost surely, 2^{31544351223431} is an apocalyptic number.

31544351223431 is a deficient number, since it is larger than the sum of its proper divisors (161355841).

31544351223431 is a wasteful number, since it uses less digits than its factorization.

31544351223431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161355840.

The product of its digits is 518400, while the sum is 41.

Adding to 31544351223431 its reverse (13432215344513), we get a palindrome (44976566567944).

The spelling of 31544351223431 in words is "thirty-one trillion, five hundred forty-four billion, three hundred fifty-one million, two hundred twenty-three thousand, four hundred thirty-one".