261017242 has 8 divisors (see below), whose sum is σ = 395925300. Its totient is φ = 129042144.

The previous prime is 261017221. The next prime is 261017249. The reversal of 261017242 is 242710162.

It can be written as a sum of positive squares in 2 ways, for example, as 243703321 + 17313921 = 15611^2 + 4161^2 .

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

It is not an unprimeable number, because it can be changed into a prime (261017249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 733017 + ... + 733372.

Almost surely, 2^261017242 is an apocalyptic number.

261017242 is a deficient number, since it is larger than the sum of its proper divisors (134908058).

261017242 is a wasteful number, since it uses less digits than its factorization.

261017242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1466480.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 261017242 is about 16156.0280390943. The cubic root of 261017242 is about 639.0817250773.

The spelling of 261017242 in words is "two hundred sixty-one million, seventeen thousand, two hundred forty-two".