2171777493 has 12 divisors (see below), whose sum is σ = 2976086400. Its totient is φ = 1408717872.

The previous prime is 2171777477. The next prime is 2171777497. The reversal of 2171777493 is 3947771712.

It is not a de Polignac number, because 2171777493 - 2⁴ = 2171777477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2171777497) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 260293 + ... + 268506.

It is an arithmetic number, because the mean of its divisors is an integer number (248007200).

Almost surely, 2^2171777493 is an apocalyptic number.

It is an amenable number.

2171777493 is a deficient number, since it is larger than the sum of its proper divisors (804308907).

2171777493 is an equidigital number, since it uses as much as digits as its factorization.

2171777493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528876 (or 528839 counting only the distinct ones).

The product of its digits is 518616, while the sum is 48.

The square root of 2171777493 is about 46602.3335574518. Note that the first 3 decimals coincide. The cubic root of 2171777493 is about 1295.0059863669.

The spelling of 2171777493 in words is "two billion, one hundred seventy-one million, seven hundred seventy-seven thousand, four hundred ninety-three".