1606145221 has 16 divisors (see below), whose sum is σ = 1710331200. Its totient is φ = 1503992448.

The previous prime is 1606145209. The next prime is 1606145243. The reversal of 1606145221 is 1225416061.

It is a cyclic number.

It is not a de Polignac number, because 1606145221 - 2²³ = 1597756613 is a prime.

It is a super-2 number, since 2×1606145221² = 5159404941882277682, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1606145221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1606146221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1684881 + ... + 1685833.

It is an arithmetic number, because the mean of its divisors is an integer number (106895700).

Almost surely, 2^1606145221 is an apocalyptic number.

It is an amenable number.

1606145221 is a deficient number, since it is larger than the sum of its proper divisors (104185979).

1606145221 is a wasteful number, since it uses less digits than its factorization.

1606145221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1908.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 1606145221 is about 40076.7416464962. The cubic root of 1606145221 is about 1171.1025769200.

The spelling of 1606145221 in words is "one billion, six hundred six million, one hundred forty-five thousand, two hundred twenty-one".