8401609 has 4 divisors (see below), whose sum is σ = 8418816. Its totient is φ = 8384404.

The previous prime is 8401573. The next prime is 8401633. The reversal of 8401609 is 9061048.

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.

It is a cyclic number.

It is not a de Polignac number, because 8401609 - 2¹¹ = 8399561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8401639) 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, 7849 + ... + 8854.

It is an arithmetic number, because the mean of its divisors is an integer number (2104704).

Almost surely, 2^8401609 is an apocalyptic number.

It is an amenable number.

8401609 is a deficient number, since it is larger than the sum of its proper divisors (17207).

8401609 is a wasteful number, since it uses less digits than its factorization.

8401609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17206.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 8401609 is about 2898.5529148180. The cubic root of 8401609 is about 203.2922497545.

The spelling of 8401609 in words is "eight million, four hundred one thousand, six hundred nine".