2171661629 has 2 divisors, whose sum is σ = 2171661630. Its totient is φ = 2171661628.

The previous prime is 2171661623. The next prime is 2171661659. The reversal of 2171661629 is 9261661712.

2171661629 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1307184025 + 864477604 = 36155^2 + 29402^2 .

It is a cyclic number.

It is not a de Polignac number, because 2171661629 - 2¹⁶ = 2171596093 is a prime.

It is a super-2 number, since 2×2171661629² = 9432228461741867282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2171661623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1085830814 + 1085830815.

It is an arithmetic number, because the mean of its divisors is an integer number (1085830815).

Almost surely, 2^2171661629 is an apocalyptic number.

It is an amenable number.

2171661629 is a deficient number, since it is larger than the sum of its proper divisors (1).

2171661629 is an equidigital number, since it uses as much as digits as its factorization.

2171661629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 41.

The square root of 2171661629 is about 46601.0904271563. The cubic root of 2171661629 is about 1294.9829564997.

The spelling of 2171661629 in words is "two billion, one hundred seventy-one million, six hundred sixty-one thousand, six hundred twenty-nine".