1616641 has 8 divisors (see below), whose sum is σ = 1788584. Its totient is φ = 1451520.

The previous prime is 1616639. The next prime is 1616651. The reversal of 1616641 is 1466161.

It can be written as a sum of positive squares in 4 ways, for example, as 450241 + 1166400 = 671^2 + 1080^2 .

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 1616641 - 2¹ = 1616639 is a prime.

It is a super-2 number, since 2×1616641² = 5227056245762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1616611) 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, 1200 + ... + 2161.

It is an arithmetic number, because the mean of its divisors is an integer number (223573).

2^1616641 is an apocalyptic number.

It is an amenable number.

1616641 is a deficient number, since it is larger than the sum of its proper divisors (171943).

1616641 is a wasteful number, since it uses less digits than its factorization.

1616641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3411.

The product of its digits is 864, while the sum is 25.

The square root of 1616641 is about 1271.4719816024. The cubic root of 1616641 is about 117.3647999785.

It can be divided in two parts, 16 and 16641, that multiplied together give a square (266256 = 516²).

The spelling of 1616641 in words is "one million, six hundred sixteen thousand, six hundred forty-one".