31440423431433 has 4 divisors (see below), whose sum is σ = 41920564575248. Its totient is φ = 20960282287620.

The previous prime is 31440423431407. The next prime is 31440423431441. The reversal of 31440423431433 is 33413432404413.

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.

It is not a de Polignac number, because 31440423431433 - 2⁸ = 31440423431177 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31440423431391 and 31440423431400.

It is not an unprimeable number, because it can be changed into a prime (31440423431533) 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, 5240070571903 + ... + 5240070571908.

It is an arithmetic number, because the mean of its divisors is an integer number (10480141143812).

Almost surely, 2^{31440423431433} is an apocalyptic number.

It is an amenable number.

31440423431433 is a deficient number, since it is larger than the sum of its proper divisors (10480141143815).

31440423431433 is a wasteful number, since it uses less digits than its factorization.

31440423431433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10480141143814.

The product of its (nonzero) digits is 497664, while the sum is 39.

Adding to 31440423431433 its reverse (33413432404413), we get a palindrome (64853855835846).

The spelling of 31440423431433 in words is "thirty-one trillion, four hundred forty billion, four hundred twenty-three million, four hundred thirty-one thousand, four hundred thirty-three".