172298561 has 2 divisors, whose sum is σ = 172298562. Its totient is φ = 172298560.

The previous prime is 172298537. The next prime is 172298573. The reversal of 172298561 is 165892271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103408561 + 68890000 = 10169^2 + 8300^2 .

It is an emirp because it is prime and its reverse (165892271) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172298561 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (172298261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86149280 + 86149281.

It is an arithmetic number, because the mean of its divisors is an integer number (86149281).

Almost surely, 2^172298561 is an apocalyptic number.

It is an amenable number.

172298561 is a deficient number, since it is larger than the sum of its proper divisors (1).

172298561 is an equidigital number, since it uses as much as digits as its factorization.

172298561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 41.

The square root of 172298561 is about 13126.2546447949. The cubic root of 172298561 is about 556.4513710004.

The spelling of 172298561 in words is "one hundred seventy-two million, two hundred ninety-eight thousand, five hundred sixty-one".