2171798357 has 2 divisors, whose sum is σ = 2171798358. Its totient is φ = 2171798356.

The previous prime is 2171798353. The next prime is 2171798393. The reversal of 2171798357 is 7538971712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2072616676 + 99181681 = 45526^2 + 9959^2 .

It is a cyclic number.

It is not a de Polignac number, because 2171798357 - 2² = 2171798353 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2171798351) 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 as a sum of consecutive naturals, namely, 1085899178 + 1085899179.

It is an arithmetic number, because the mean of its divisors is an integer number (1085899179).

Almost surely, 2^2171798357 is an apocalyptic number.

It is an amenable number.

2171798357 is a deficient number, since it is larger than the sum of its proper divisors (1).

2171798357 is an equidigital number, since it uses as much as digits as its factorization.

2171798357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 740880, while the sum is 50.

The square root of 2171798357 is about 46602.5574083655. The cubic root of 2171798357 is about 1295.0101333415.

The spelling of 2171798357 in words is "two billion, one hundred seventy-one million, seven hundred ninety-eight thousand, three hundred fifty-seven".