31440224423 has 4 divisors (see below), whose sum is σ = 31445752728. Its totient is φ = 31434696120.

The previous prime is 31440224399. The next prime is 31440224437. The reversal of 31440224423 is 32442204413.

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 31440224423 - 2¹² = 31440220327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31440224723) 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, 2755613 + ... + 2766998.

It is an arithmetic number, because the mean of its divisors is an integer number (7861438182).

Almost surely, 2^31440224423 is an apocalyptic number.

31440224423 is a deficient number, since it is larger than the sum of its proper divisors (5528305).

31440224423 is an equidigital number, since it uses as much as digits as its factorization.

31440224423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5528304.

The product of its (nonzero) digits is 18432, while the sum is 29.

Adding to 31440224423 its reverse (32442204413), we get a palindrome (63882428836).

The spelling of 31440224423 in words is "thirty-one billion, four hundred forty million, two hundred twenty-four thousand, four hundred twenty-three".