615641 has 16 divisors (see below), whose sum is σ = 725760. Its totient is φ = 517440.

The previous prime is 615623. The next prime is 615661. The reversal of 615641 is 146516.

615641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 615641 - 2⁶ = 615577 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (615661) 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, 8636 + ... + 8706.

It is an arithmetic number, because the mean of its divisors is an integer number (45360).

2⁶¹⁵⁶⁴¹ is an apocalyptic number.

It is an amenable number.

615641 is a deficient number, since it is larger than the sum of its proper divisors (110119).

615641 is a wasteful number, since it uses less digits than its factorization.

615641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136.

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

The square root of 615641 is about 784.6279373053. The cubic root of 615641 is about 85.0698848566.

The spelling of 615641 in words is "six hundred fifteen thousand, six hundred forty-one".