615563 has 4 divisors (see below), whose sum is σ = 662928. Its totient is φ = 568200.

The previous prime is 615557. The next prime is 615577. The reversal of 615563 is 365516.

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

It is a cyclic number.

It is not a de Polignac number, because 615563 - 2¹² = 611467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (614563) 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, 23663 + ... + 23688.

It is an arithmetic number, because the mean of its divisors is an integer number (165732).

2⁶¹⁵⁵⁶³ is an apocalyptic number.

615563 is a deficient number, since it is larger than the sum of its proper divisors (47365).

615563 is a wasteful number, since it uses less digits than its factorization.

615563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47364.

The product of its digits is 2700, while the sum is 26.

The square root of 615563 is about 784.5782306437. The cubic root of 615563 is about 85.0662919990.

Subtracting from 615563 its reverse (365516), we obtain a cube (250047 = 63³).

The spelling of 615563 in words is "six hundred fifteen thousand, five hundred sixty-three".