1606122421 has 16 divisors (see below), whose sum is σ = 1720541440. Its totient is φ = 1494858240.

The previous prime is 1606122409. The next prime is 1606122439. The reversal of 1606122421 is 1242216061.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1606122421 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 (1606122451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 373741 + ... + 378013.

It is an arithmetic number, because the mean of its divisors is an integer number (107533840).

Almost surely, 2^1606122421 is an apocalyptic number.

It is an amenable number.

1606122421 is a deficient number, since it is larger than the sum of its proper divisors (114419019).

1606122421 is a wasteful number, since it uses less digits than its factorization.

1606122421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4636.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 1606122421 is about 40076.4571912239. The cubic root of 1606122421 is about 1171.0970354399.

Adding to 1606122421 its reverse (1242216061), we get a palindrome (2848338482).

The spelling of 1606122421 in words is "one billion, six hundred six million, one hundred twenty-two thousand, four hundred twenty-one".