169742609 has 2 divisors, whose sum is σ = 169742610. Its totient is φ = 169742608.

The previous prime is 169742563. The next prime is 169742627. The reversal of 169742609 is 906247961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 150601984 + 19140625 = 12272^2 + 4375^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-169742609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 169742609.

It is not a weakly prime, because it can be changed into another prime (169742689) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84871304 + 84871305.

It is an arithmetic number, because the mean of its divisors is an integer number (84871305).

Almost surely, 2^169742609 is an apocalyptic number.

It is an amenable number.

169742609 is a deficient number, since it is larger than the sum of its proper divisors (1).

169742609 is an equidigital number, since it uses as much as digits as its factorization.

169742609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 169742609 is about 13028.5305771603. The cubic root of 169742609 is about 553.6861044209.

The spelling of 169742609 in words is "one hundred sixty-nine million, seven hundred forty-two thousand, six hundred nine".