261118245 has 8 divisors (see below), whose sum is σ = 417789216. Its totient is φ = 139263056.

The previous prime is 261118243. The next prime is 261118259. The reversal of 261118245 is 542811162.

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 261118245 - 2¹ = 261118243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261118243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8703927 + ... + 8703956.

It is an arithmetic number, because the mean of its divisors is an integer number (52223652).

Almost surely, 2^261118245 is an apocalyptic number.

It is an amenable number.

261118245 is a deficient number, since it is larger than the sum of its proper divisors (156670971).

261118245 is a wasteful number, since it uses less digits than its factorization.

261118245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17407891.

The product of its digits is 3840, while the sum is 30.

The square root of 261118245 is about 16159.1535978838. The cubic root of 261118245 is about 639.1641472790.

The spelling of 261118245 in words is "two hundred sixty-one million, one hundred eighteen thousand, two hundred forty-five".