169987073 has 4 divisors (see below), whose sum is σ = 170245680. Its totient is φ = 169728468.

The previous prime is 169987049. The next prime is 169987079. The reversal of 169987073 is 370789961.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 370789961 = 53 ⋅6996037.

It is a cyclic number.

It is not a de Polignac number, because 169987073 - 2¹² = 169982977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (169987079) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128315 + ... + 129632.

It is an arithmetic number, because the mean of its divisors is an integer number (42561420).

Almost surely, 2^169987073 is an apocalyptic number.

It is an amenable number.

169987073 is a deficient number, since it is larger than the sum of its proper divisors (258607).

169987073 is an equidigital number, since it uses as much as digits as its factorization.

169987073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258606.

The product of its (nonzero) digits is 571536, while the sum is 50.

The square root of 169987073 is about 13037.9090731605. The cubic root of 169987073 is about 553.9517839152.

The spelling of 169987073 in words is "one hundred sixty-nine million, nine hundred eighty-seven thousand, seventy-three".