261722697 has 8 divisors (see below), whose sum is σ = 349373280. Its totient is φ = 174276960.

The previous prime is 261722689. The next prime is 261722707. The reversal of 261722697 is 796227162.

261722697 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 261722697 - 2³ = 261722689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261722627) 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, 48204 + ... + 53357.

It is an arithmetic number, because the mean of its divisors is an integer number (43671660).

Almost surely, 2^261722697 is an apocalyptic number.

It is an amenable number.

261722697 is a deficient number, since it is larger than the sum of its proper divisors (87650583).

261722697 is a wasteful number, since it uses less digits than its factorization.

261722697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102423.

The product of its digits is 127008, while the sum is 42.

The square root of 261722697 is about 16177.8458702016. The cubic root of 261722697 is about 639.6569589031.

The spelling of 261722697 in words is "two hundred sixty-one million, seven hundred twenty-two thousand, six hundred ninety-seven".