31440203423 has 4 divisors (see below), whose sum is σ = 31445540880. Its totient is φ = 31434865968.

The previous prime is 31440203419. The next prime is 31440203447. The reversal of 31440203423 is 32430204413.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32430204413 = 61681 ⋅525773.

It is a cyclic number.

It is not a de Polignac number, because 31440203423 - 2² = 31440203419 is a prime.

It is a super-3 number, since 3×31440203423³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31440203392 and 31440203401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31440203323) 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, 2659883 + ... + 2671676.

It is an arithmetic number, because the mean of its divisors is an integer number (7861385220).

Almost surely, 2^31440203423 is an apocalyptic number.

31440203423 is a deficient number, since it is larger than the sum of its proper divisors (5337457).

31440203423 is an equidigital number, since it uses as much as digits as its factorization.

31440203423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5337456.

The product of its (nonzero) digits is 6912, while the sum is 26.

Adding to 31440203423 its reverse (32430204413), we get a palindrome (63870407836).

The spelling of 31440203423 in words is "thirty-one billion, four hundred forty million, two hundred three thousand, four hundred twenty-three".