616641 has 16 divisors (see below), whose sum is σ = 886464. Its totient is φ = 379904.

The previous prime is 616639. The next prime is 616643. The reversal of 616641 is 146616.

It is an interprime number because it is at equal distance from previous prime (616639) and next prime (616643).

It is a cyclic number.

It is not a de Polignac number, because 616641 - 2¹ = 616639 is a prime.

It is a super-2 number, since 2×616641² = 760492245762, which contains 22 as substring.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (616643) 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, 5401 + ... + 5513.

It is an arithmetic number, because the mean of its divisors is an integer number (55404).

2⁶¹⁶⁶⁴¹ is an apocalyptic number.

It is an amenable number.

616641 is a deficient number, since it is larger than the sum of its proper divisors (269823).

616641 is a wasteful number, since it uses less digits than its factorization.

616641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240.

The product of its digits is 864, while the sum is 24.

The square root of 616641 is about 785.2649234494. The cubic root of 616641 is about 85.1159202712.

The spelling of 616641 in words is "six hundred sixteen thousand, six hundred forty-one".