261118945 has 8 divisors (see below), whose sum is σ = 313764480. Its totient is φ = 208614000.

The previous prime is 261118933. The next prime is 261118961. The reversal of 261118945 is 549811162.

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

It is not a de Polignac number, because 261118945 - 2⁹ = 261118433 is a prime.

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, 31015 + ... + 38524.

It is an arithmetic number, because the mean of its divisors is an integer number (39220560).

Almost surely, 2^261118945 is an apocalyptic number.

It is an amenable number.

261118945 is a deficient number, since it is larger than the sum of its proper divisors (52645535).

261118945 is an equidigital number, since it uses as much as digits as its factorization.

261118945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70295.

The product of its digits is 17280, while the sum is 37.

The square root of 261118945 is about 16159.1752574195. The cubic root of 261118945 is about 639.1647184308.

The spelling of 261118945 in words is "two hundred sixty-one million, one hundred eighteen thousand, nine hundred forty-five".