616491 has 24 divisors (see below), whose sum is σ = 960960. Its totient is φ = 394632.

The previous prime is 616489. The next prime is 616501. The reversal of 616491 is 194616.

616491 = 58³ + 59³ + 60³.

616491 is a `hidden beast` number, since 616 + 49 + 1 = 666.

It is not a de Polignac number, because 616491 - 2¹ = 616489 is a prime.

It is a super-2 number, since 2×616491² = 760122306162, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616411) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10420 + ... + 10478.

It is an arithmetic number, because the mean of its divisors is an integer number (40040).

2⁶¹⁶⁴⁹¹ is an apocalyptic number.

616491 is a deficient number, since it is larger than the sum of its proper divisors (344469).

616491 is an equidigital number, since it uses as much as digits as its factorization.

616491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117 (or 105 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 616491 is about 785.1694084718. The cubic root of 616491 is about 85.1090181334.

Subtracting from 616491 its reverse (194616), we obtain a cube (421875 = 75³).

The spelling of 616491 in words is "six hundred sixteen thousand, four hundred ninety-one".