261315241 has 4 divisors (see below), whose sum is σ = 285071184. Its totient is φ = 237559300.

The previous prime is 261315239. The next prime is 261315251. The reversal of 261315241 is 142513162.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 261315241 - 2¹ = 261315239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261315251) 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, 11877955 + ... + 11877976.

It is an arithmetic number, because the mean of its divisors is an integer number (71267796).

Almost surely, 2^261315241 is an apocalyptic number.

It is an amenable number.

261315241 is a deficient number, since it is larger than the sum of its proper divisors (23755943).

261315241 is a wasteful number, since it uses less digits than its factorization.

261315241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23755942.

The product of its digits is 1440, while the sum is 25.

The square root of 261315241 is about 16165.2479411854. The cubic root of 261315241 is about 639.3248422027.

The spelling of 261315241 in words is "two hundred sixty-one million, three hundred fifteen thousand, two hundred forty-one".