2171649629 has 2 divisors, whose sum is σ = 2171649630. Its totient is φ = 2171649628.

The previous prime is 2171649611. The next prime is 2171649647. The reversal of 2171649629 is 9269461712.

2171649629 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (2171649611) and next prime (2171649647).

It can be written as a sum of positive squares in only one way, i.e., 1216963225 + 954686404 = 34885^2 + 30898^2 .

It is a cyclic number.

It is not a de Polignac number, because 2171649629 - 2²⁴ = 2154872413 is a prime.

It is a super-2 number, since 2×2171649629² = 9432124222271675282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2171649679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1085824814 + 1085824815.

It is an arithmetic number, because the mean of its divisors is an integer number (1085824815).

Almost surely, 2^2171649629 is an apocalyptic number.

It is an amenable number.

2171649629 is a deficient number, since it is larger than the sum of its proper divisors (1).

2171649629 is an equidigital number, since it uses as much as digits as its factorization.

2171649629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 47.

The square root of 2171649629 is about 46600.9616746264. The cubic root of 2171649629 is about 1294.9805712563.

The spelling of 2171649629 in words is "two billion, one hundred seventy-one million, six hundred forty-nine thousand, six hundred twenty-nine".