169499421 has 48 divisors (see below), whose sum is σ = 308404096. Its totient is φ = 87308928.

The previous prime is 169499417. The next prime is 169499423. The reversal of 169499421 is 124994961.

169499421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 169499421 - 2² = 169499417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (169499423) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 32811 + ... + 37623.

Almost surely, 2^169499421 is an apocalyptic number.

It is an amenable number.

169499421 is a deficient number, since it is larger than the sum of its proper divisors (138904675).

169499421 is a wasteful number, since it uses less digits than its factorization.

169499421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4882 (or 4879 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 169499421 is about 13019.1943299115. The cubic root of 169499421 is about 553.4215584473.

The spelling of 169499421 in words is "one hundred sixty-nine million, four hundred ninety-nine thousand, four hundred twenty-one".