2172643541 has 4 divisors (see below), whose sum is σ = 2172843552. Its totient is φ = 2172443532.

The previous prime is 2172643513. The next prime is 2172643567. The reversal of 2172643541 is 1453462712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2172643541 - 2⁶ = 2172643477 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2172643511) 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, 82715 + ... + 105768.

It is an arithmetic number, because the mean of its divisors is an integer number (543210888).

Almost surely, 2^2172643541 is an apocalyptic number.

It is an amenable number.

2172643541 is a deficient number, since it is larger than the sum of its proper divisors (200011).

2172643541 is a wasteful number, since it uses less digits than its factorization.

2172643541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200010.

The product of its digits is 40320, while the sum is 35.

The square root of 2172643541 is about 46611.6245265063. The cubic root of 2172643541 is about 1295.1781016505.

The spelling of 2172643541 in words is "two billion, one hundred seventy-two million, six hundred forty-three thousand, five hundred forty-one".