199545802531 has 32 divisors (see below), whose sum is σ = 209687740416. Its totient is φ = 189751380000.

The previous prime is 199545802529. The next prime is 199545802549. The reversal of 199545802531 is 135208545991.

It is a cyclic number.

It is not a de Polignac number, because 199545802531 - 2¹ = 199545802529 is a prime.

It is a super-2 number, since 2×199545802531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199545802571) 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 31 ways as a sum of consecutive naturals, for example, 66007686 + ... + 66010708.

It is an arithmetic number, because the mean of its divisors is an integer number (6552741888).

Almost surely, 2^199545802531 is an apocalyptic number.

199545802531 is a deficient number, since it is larger than the sum of its proper divisors (10141937885).

199545802531 is a wasteful number, since it uses less digits than its factorization.

199545802531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3423.

The product of its (nonzero) digits is 1944000, while the sum is 52.

The spelling of 199545802531 in words is "one hundred ninety-nine billion, five hundred forty-five million, eight hundred two thousand, five hundred thirty-one".