172773641 has 2 divisors, whose sum is σ = 172773642. Its totient is φ = 172773640.

The previous prime is 172773617. The next prime is 172773659. The reversal of 172773641 is 146377271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 149695225 + 23078416 = 12235^2 + 4804^2 .

It is an emirp because it is prime and its reverse (146377271) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172773641 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 172773595 and 172773604.

It is not a weakly prime, because it can be changed into another prime (172773661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86386820 + 86386821.

It is an arithmetic number, because the mean of its divisors is an integer number (86386821).

Almost surely, 2^172773641 is an apocalyptic number.

It is an amenable number.

172773641 is a deficient number, since it is larger than the sum of its proper divisors (1).

172773641 is an equidigital number, since it uses as much as digits as its factorization.

172773641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 49392, while the sum is 38.

The square root of 172773641 is about 13144.3387433526. The cubic root of 172773641 is about 556.9623373804.

The spelling of 172773641 in words is "one hundred seventy-two million, seven hundred seventy-three thousand, six hundred forty-one".