31403203423 has 4 divisors (see below), whose sum is σ = 31413635928. Its totient is φ = 31392770920.

The previous prime is 31403203397. The next prime is 31403203459. The reversal of 31403203423 is 32430230413.

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 31403203423 - 2²¹ = 31401106271 is a prime.

It is a super-2 number, since 2×31403203423² (a number of 22 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 (31403203463) 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, 5211736 + ... + 5217757.

It is an arithmetic number, because the mean of its divisors is an integer number (7853408982).

Almost surely, 2^31403203423 is an apocalyptic number.

31403203423 is a deficient number, since it is larger than the sum of its proper divisors (10432505).

31403203423 is a wasteful number, since it uses less digits than its factorization.

31403203423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10432504.

The product of its (nonzero) digits is 5184, while the sum is 25.

Adding to 31403203423 its reverse (32430230413), we get a palindrome (63833433836).

The spelling of 31403203423 in words is "thirty-one billion, four hundred three million, two hundred three thousand, four hundred twenty-three".