172341509 has 2 divisors, whose sum is σ = 172341510. Its totient is φ = 172341508.

The previous prime is 172341397. The next prime is 172341629. The reversal of 172341509 is 905143271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101949409 + 70392100 = 10097^2 + 8390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172341509 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172341109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86170754 + 86170755.

It is an arithmetic number, because the mean of its divisors is an integer number (86170755).

Almost surely, 2^172341509 is an apocalyptic number.

It is an amenable number.

172341509 is a deficient number, since it is larger than the sum of its proper divisors (1).

172341509 is an equidigital number, since it uses as much as digits as its factorization.

172341509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 172341509 is about 13127.8905007621. The cubic root of 172341509 is about 556.4976017755.

The spelling of 172341509 in words is "one hundred seventy-two million, three hundred forty-one thousand, five hundred nine".