261612415 has 8 divisors (see below), whose sum is σ = 314245008. Its totient is φ = 209083200.

The previous prime is 261612413. The next prime is 261612427. The reversal of 261612415 is 514216162.

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

It is not a de Polignac number, because 261612415 - 2¹ = 261612413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261612413) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20161 + ... + 30490.

It is an arithmetic number, because the mean of its divisors is an integer number (39280626).

Almost surely, 2^261612415 is an apocalyptic number.

261612415 is a deficient number, since it is larger than the sum of its proper divisors (52632593).

261612415 is a wasteful number, since it uses less digits than its factorization.

261612415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51689.

The product of its digits is 2880, while the sum is 28.

The square root of 261612415 is about 16174.4370844861. The cubic root of 261612415 is about 639.5671022724.

Adding to 261612415 its reverse (514216162), we get a palindrome (775828577).

The spelling of 261612415 in words is "two hundred sixty-one million, six hundred twelve thousand, four hundred fifteen".