2172557771 has 4 divisors (see below), whose sum is σ = 2172735000. Its totient is φ = 2172380544.

The previous prime is 2172557743. The next prime is 2172557819. The reversal of 2172557771 is 1777552712.

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

It is a cyclic number.

It is not a de Polignac number, because 2172557771 - 2¹⁴ = 2172541387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2172557731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68741 + ... + 95238.

It is an arithmetic number, because the mean of its divisors is an integer number (543183750).

Almost surely, 2^2172557771 is an apocalyptic number.

2172557771 is a deficient number, since it is larger than the sum of its proper divisors (177229).

2172557771 is a wasteful number, since it uses less digits than its factorization.

2172557771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177228.

The product of its digits is 240100, while the sum is 44.

The square root of 2172557771 is about 46610.7044679653. The cubic root of 2172557771 is about 1295.1610580681.

The spelling of 2172557771 in words is "two billion, one hundred seventy-two million, five hundred fifty-seven thousand, seven hundred seventy-one".