6172543621 has 4 divisors (see below), whose sum is σ = 6177304012. Its totient is φ = 6167783232.

The previous prime is 6172543589. The next prime is 6172543667. The reversal of 6172543621 is 1263452716.

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 2976902721 + 3195640900 = 54561^2 + 56530^2 .

It is a cyclic number.

It is not a de Polignac number, because 6172543621 - 2⁵ = 6172543589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6172543681) 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, 2378250 + ... + 2380843.

It is an arithmetic number, because the mean of its divisors is an integer number (1544326003).

Almost surely, 2^6172543621 is an apocalyptic number.

It is an amenable number.

6172543621 is a deficient number, since it is larger than the sum of its proper divisors (4760391).

6172543621 is a wasteful number, since it uses less digits than its factorization.

6172543621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4760390.

The product of its digits is 60480, while the sum is 37.

The square root of 6172543621 is about 78565.5371075639. The cubic root of 6172543621 is about 1834.3747169559.

The spelling of 6172543621 in words is "six billion, one hundred seventy-two million, five hundred forty-three thousand, six hundred twenty-one".