31323432403 has 4 divisors (see below), whose sum is σ = 31461421320. Its totient is φ = 31185443488.

The previous prime is 31323432397. The next prime is 31323432407. The reversal of 31323432403 is 30423432313.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31323432403 is a prime.

It is a super-3 number, since 3×31323432403³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31323432407) 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, 68994118 + ... + 68994571.

It is an arithmetic number, because the mean of its divisors is an integer number (7865355330).

Almost surely, 2^31323432403 is an apocalyptic number.

31323432403 is a deficient number, since it is larger than the sum of its proper divisors (137988917).

31323432403 is a wasteful number, since it uses less digits than its factorization.

31323432403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137988916.

The product of its (nonzero) digits is 15552, while the sum is 28.

Adding to 31323432403 its reverse (30423432313), we get a palindrome (61746864716).

The spelling of 31323432403 in words is "thirty-one billion, three hundred twenty-three million, four hundred thirty-two thousand, four hundred three".