615381 has 16 divisors (see below), whose sum is σ = 913920. Its totient is φ = 365760.

The previous prime is 615379. The next prime is 615389. The reversal of 615381 is 183516.

It is not a de Polignac number, because 615381 - 2¹ = 615379 is a prime.

It is a super-2 number, since 2×615381² = 757387550322, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 615381.

It is not an unprimeable number, because it can be changed into a prime (615389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 955 + ... + 1463.

It is an arithmetic number, because the mean of its divisors is an integer number (57120).

2⁶¹⁵³⁸¹ is an apocalyptic number.

It is an amenable number.

615381 is a deficient number, since it is larger than the sum of its proper divisors (298539).

615381 is a wasteful number, since it uses less digits than its factorization.

615381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556.

The product of its digits is 720, while the sum is 24.

The square root of 615381 is about 784.4622361848. The cubic root of 615381 is about 85.0579074842.

Adding to 615381 its reverse (183516), we get a palindrome (798897).

The spelling of 615381 in words is "six hundred fifteen thousand, three hundred eighty-one".