1606376221 has 4 divisors (see below), whose sum is σ = 1610103744. Its totient is φ = 1602648700.

The previous prime is 1606376179. The next prime is 1606376227. The reversal of 1606376221 is 1226736061.

It is a happy number.

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 1606376221 - 2⁹ = 1606375709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1606376227) 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, 1863115 + ... + 1863976.

It is an arithmetic number, because the mean of its divisors is an integer number (402525936).

Almost surely, 2^1606376221 is an apocalyptic number.

It is an amenable number.

1606376221 is a deficient number, since it is larger than the sum of its proper divisors (3727523).

1606376221 is an equidigital number, since it uses as much as digits as its factorization.

1606376221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3727522.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 1606376221 is about 40079.6235137008. The cubic root of 1606376221 is about 1171.1587179056.

The spelling of 1606376221 in words is "one billion, six hundred six million, three hundred seventy-six thousand, two hundred twenty-one".