2173638541 has 2 divisors, whose sum is σ = 2173638542. Its totient is φ = 2173638540.

The previous prime is 2173638499. The next prime is 2173638557. The reversal of 2173638541 is 1458363712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1947015625 + 226622916 = 44125^2 + 15054^2 .

It is a cyclic number.

It is not a de Polignac number, because 2173638541 - 2⁷ = 2173638413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2173638494 and 2173638503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2173638641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1086819270 + 1086819271.

It is an arithmetic number, because the mean of its divisors is an integer number (1086819271).

Almost surely, 2^2173638541 is an apocalyptic number.

It is an amenable number.

2173638541 is a deficient number, since it is larger than the sum of its proper divisors (1).

2173638541 is an equidigital number, since it uses as much as digits as its factorization.

2173638541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 40.

The square root of 2173638541 is about 46622.2966079536. The cubic root of 2173638541 is about 1295.3757879420.

The spelling of 2173638541 in words is "two billion, one hundred seventy-three million, six hundred thirty-eight thousand, five hundred forty-one".