616145 has 4 divisors (see below), whose sum is σ = 739380. Its totient is φ = 492912.

The previous prime is 616141. The next prime is 616153. The reversal of 616145 is 541616.

616145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 452929 + 163216 = 673^2 + 404^2 .

It is a cyclic number.

It is not a de Polignac number, because 616145 - 2² = 616141 is a prime.

It is a super-2 number, since 2×616145² = 759269322050, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 616145.

It is not an unprimeable number, because it can be changed into a prime (616141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61610 + ... + 61619.

It is an arithmetic number, because the mean of its divisors is an integer number (184845).

2⁶¹⁶¹⁴⁵ is an apocalyptic number.

It is an amenable number.

616145 is a deficient number, since it is larger than the sum of its proper divisors (123235).

616145 is a wasteful number, since it uses less digits than its factorization.

616145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123234.

The product of its digits is 720, while the sum is 23.

The square root of 616145 is about 784.9490429321. The cubic root of 616145 is about 85.0930929314.

Subtracting from 616145 its reverse (541616), we obtain a square (74529 = 273²).

The spelling of 616145 in words is "six hundred sixteen thousand, one hundred forty-five".