615541 has 4 divisors (see below), whose sum is σ = 620172. Its totient is φ = 610912.

The previous prime is 615539. The next prime is 615557. The reversal of 615541 is 145516.

615541 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 531441 + 84100 = 729^2 + 290^2 .

It is a cyclic number.

It is not a de Polignac number, because 615541 - 2¹ = 615539 is a prime.

It is a Duffinian number.

615541 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (615521) 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, 2110 + ... + 2383.

It is an arithmetic number, because the mean of its divisors is an integer number (155043).

2⁶¹⁵⁵⁴¹ is an apocalyptic number.

It is an amenable number.

615541 is a deficient number, since it is larger than the sum of its proper divisors (4631).

615541 is a wasteful number, since it uses less digits than its factorization.

615541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4630.

The product of its digits is 600, while the sum is 22.

The square root of 615541 is about 784.5642102467. The cubic root of 615541 is about 85.0652785740.

It can be divided in two parts, 615 and 541, that added together give a square (1156 = 34²).

The spelling of 615541 in words is "six hundred fifteen thousand, five hundred forty-one".