615261 has 8 divisors (see below), whose sum is σ = 832864. Its totient is φ = 403920.

The previous prime is 615259. The next prime is 615269. The reversal of 615261 is 162516.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 615261 - 2¹ = 615259 is a prime.

It is a Duffinian number.

615261 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (615269) 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 7 ways as a sum of consecutive naturals, for example, 1330 + ... + 1731.

It is an arithmetic number, because the mean of its divisors is an integer number (104108).

2⁶¹⁵²⁶¹ is an apocalyptic number.

It is an amenable number.

615261 is a deficient number, since it is larger than the sum of its proper divisors (217603).

615261 is a wasteful number, since it uses less digits than its factorization.

615261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3131.

The product of its digits is 360, while the sum is 21.

The square root of 615261 is about 784.3857469383. The cubic root of 615261 is about 85.0523783283.

Adding to 615261 its reverse (162516), we get a palindrome (777777).

The spelling of 615261 in words is "six hundred fifteen thousand, two hundred sixty-one".