169139497 has 2 divisors, whose sum is σ = 169139498. Its totient is φ = 169139496.

The previous prime is 169139449. The next prime is 169139561. The reversal of 169139497 is 794931961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153859216 + 15280281 = 12404^2 + 3909^2 .

It is a cyclic number.

It is not a de Polignac number, because 169139497 - 2²⁷ = 34921769 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 169139497.

It is not a weakly prime, because it can be changed into another prime (169139297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84569748 + 84569749.

It is an arithmetic number, because the mean of its divisors is an integer number (84569749).

Almost surely, 2^169139497 is an apocalyptic number.

It is an amenable number.

169139497 is a deficient number, since it is larger than the sum of its proper divisors (1).

169139497 is an equidigital number, since it uses as much as digits as its factorization.

169139497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 367416, while the sum is 49.

The square root of 169139497 is about 13005.3641625292. The cubic root of 169139497 is about 553.0295593550.

The spelling of 169139497 in words is "one hundred sixty-nine million, one hundred thirty-nine thousand, four hundred ninety-seven".