2171631899 has 2 divisors, whose sum is σ = 2171631900. Its totient is φ = 2171631898.

The previous prime is 2171631893. The next prime is 2171631929. The reversal of 2171631899 is 9981361712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2171631899 - 2⁴ = 2171631883 is a prime.

It is not a weakly prime, because it can be changed into another prime (2171631893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1085815949 + 1085815950.

It is an arithmetic number, because the mean of its divisors is an integer number (1085815950).

Almost surely, 2^2171631899 is an apocalyptic number.

2171631899 is a deficient number, since it is larger than the sum of its proper divisors (1).

2171631899 is an equidigital number, since it uses as much as digits as its factorization.

2171631899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 47.

The square root of 2171631899 is about 46600.7714421124. The cubic root of 2171631899 is about 1294.9770470433.

The spelling of 2171631899 in words is "two billion, one hundred seventy-one million, six hundred thirty-one thousand, eight hundred ninety-nine".