31640603543 has 4 divisors (see below), whose sum is σ = 31804544688. Its totient is φ = 31476662400.

The previous prime is 31640603531. The next prime is 31640603587. The reversal of 31640603543 is 34530604613.

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 31640603543 - 2⁶ = 31640603479 is a prime.

It is a super-2 number, since 2×31640603543² (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 (31640603593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81970283 + ... + 81970668.

It is an arithmetic number, because the mean of its divisors is an integer number (7951136172).

Almost surely, 2^31640603543 is an apocalyptic number.

31640603543 is a deficient number, since it is larger than the sum of its proper divisors (163941145).

31640603543 is a wasteful number, since it uses less digits than its factorization.

31640603543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163941144.

The product of its (nonzero) digits is 77760, while the sum is 35.

The spelling of 31640603543 in words is "thirty-one billion, six hundred forty million, six hundred three thousand, five hundred forty-three".