1606420331 has 8 divisors (see below), whose sum is σ = 1614299904. Its totient is φ = 1598553000.

The previous prime is 1606420327. The next prime is 1606420337. The reversal of 1606420331 is 1330246061.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1606420331 - 2² = 1606420327 is a prime.

It is a super-2 number, since 2×1606420331² = 5161172559700299122, 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 1606420331.

It is not an unprimeable number, because it can be changed into a prime (1606420337) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 360986 + ... + 365408.

It is an arithmetic number, because the mean of its divisors is an integer number (201787488).

Almost surely, 2^1606420331 is an apocalyptic number.

1606420331 is a deficient number, since it is larger than the sum of its proper divisors (7879573).

1606420331 is a wasteful number, since it uses less digits than its factorization.

1606420331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6121.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 1606420331 is about 40080.1737895434. The cubic root of 1606420331 is about 1171.1694375485.

Adding to 1606420331 its reverse (1330246061), we get a palindrome (2936666392).

It can be divided in two parts, 16064 and 20331, that multiplied together give a square (326597184 = 18072²).

The spelling of 1606420331 in words is "one billion, six hundred six million, four hundred twenty thousand, three hundred thirty-one".