261981707 has 8 divisors (see below), whose sum is σ = 294401184. Its totient is φ = 231314688.

The previous prime is 261981691. The next prime is 261981739. The reversal of 261981707 is 707189162.

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 261981707 - 2⁴ = 261981691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261981767) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 437798 + ... + 438395.

It is an arithmetic number, because the mean of its divisors is an integer number (36800148).

Almost surely, 2^261981707 is an apocalyptic number.

261981707 is a deficient number, since it is larger than the sum of its proper divisors (32419477).

261981707 is a wasteful number, since it uses less digits than its factorization.

261981707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 876229.

The product of its (nonzero) digits is 42336, while the sum is 41.

The square root of 261981707 is about 16185.8489737178. The cubic root of 261981707 is about 639.8678983534.

The spelling of 261981707 in words is "two hundred sixty-one million, nine hundred eighty-one thousand, seven hundred seven".