31545431403 has 4 divisors (see below), whose sum is σ = 42060575208. Its totient is φ = 21030287600.

The previous prime is 31545431363. The next prime is 31545431417. The reversal of 31545431403 is 30413454513.

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 31545431403 - 2¹⁰ = 31545430379 is a prime.

It is a super-2 number, since 2×31545431403² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31545431443) 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, 5257571898 + ... + 5257571903.

It is an arithmetic number, because the mean of its divisors is an integer number (10515143802).

Almost surely, 2^31545431403 is an apocalyptic number.

31545431403 is a deficient number, since it is larger than the sum of its proper divisors (10515143805).

31545431403 is a wasteful number, since it uses less digits than its factorization.

31545431403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10515143804.

The product of its (nonzero) digits is 43200, while the sum is 33.

Adding to 31545431403 its reverse (30413454513), we get a palindrome (61958885916).

The spelling of 31545431403 in words is "thirty-one billion, five hundred forty-five million, four hundred thirty-one thousand, four hundred three".