261442615 has 8 divisors (see below), whose sum is σ = 358549920. Its totient is φ = 179274912.

The previous prime is 261442591. The next prime is 261442637. The reversal of 261442615 is 516244162.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 261442615 - 2⁵ = 261442583 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3734860 + ... + 3734929.

It is an arithmetic number, because the mean of its divisors is an integer number (44818740).

Almost surely, 2^261442615 is an apocalyptic number.

261442615 is a deficient number, since it is larger than the sum of its proper divisors (97107305).

261442615 is an equidigital number, since it uses as much as digits as its factorization.

261442615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7469801.

The product of its digits is 11520, while the sum is 31.

The square root of 261442615 is about 16169.1872090096. The cubic root of 261442615 is about 639.4287016059.

Adding to 261442615 its reverse (516244162), we get a palindrome (777686777).

The spelling of 261442615 in words is "two hundred sixty-one million, four hundred forty-two thousand, six hundred fifteen".