203964494531 has 16 divisors (see below), whose sum is σ = 247079989440. Its totient is φ = 164365578240.

The previous prime is 203964494519. The next prime is 203964494561. The reversal of 203964494531 is 135494469302.

It is a cyclic number.

It is not a de Polignac number, because 203964494531 - 2¹⁸ = 203964232387 is a prime.

It is a super-2 number, since 2×203964494531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 203964494531.

It is not an unprimeable number, because it can be changed into a prime (203964494501) 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 15 ways as a sum of consecutive naturals, for example, 811940 + ... + 1033041.

It is an arithmetic number, because the mean of its divisors is an integer number (15442499340).

Almost surely, 2^203964494531 is an apocalyptic number.

203964494531 is a deficient number, since it is larger than the sum of its proper divisors (43115494909).

203964494531 is a wasteful number, since it uses less digits than its factorization.

203964494531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1845934.

The product of its (nonzero) digits is 2799360, while the sum is 50.

The spelling of 203964494531 in words is "two hundred three billion, nine hundred sixty-four million, four hundred ninety-four thousand, five hundred thirty-one".