172887393841 has 4 divisors (see below), whose sum is σ = 173167600932. Its totient is φ = 172607186752.

The previous prime is 172887393803. The next prime is 172887393851. The reversal of 172887393841 is 148393788271.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2372079616 + 170515314225 = 48704^2 + 412935^2 .

It is a cyclic number.

It is not a de Polignac number, because 172887393841 - 2¹¹ = 172887391793 is a prime.

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 172887393841.

It is not an unprimeable number, because it can be changed into a prime (172887393851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140102620 + ... + 140103853.

It is an arithmetic number, because the mean of its divisors is an integer number (43291900233).

Almost surely, 2^172887393841 is an apocalyptic number.

It is an amenable number.

172887393841 is a deficient number, since it is larger than the sum of its proper divisors (280207091).

172887393841 is an equidigital number, since it uses as much as digits as its factorization.

172887393841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280207090.

The product of its digits is 16257024, while the sum is 61.

The spelling of 172887393841 in words is "one hundred seventy-two billion, eight hundred eighty-seven million, three hundred ninety-three thousand, eight hundred forty-one".