261172371 has 8 divisors (see below), whose sum is σ = 348369040. Its totient is φ = 174045312.

The previous prime is 261172367. The next prime is 261172397. The reversal of 261172371 is 173271162.

261172371 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 261172371 - 2² = 261172367 is a prime.

It is a super-2 number, since 2×261172371² = 136422014747523282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261172361) 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, 7906 + ... + 24183.

It is an arithmetic number, because the mean of its divisors is an integer number (43546130).

Almost surely, 2^261172371 is an apocalyptic number.

261172371 is a deficient number, since it is larger than the sum of its proper divisors (87196669).

261172371 is a wasteful number, since it uses less digits than its factorization.

261172371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34805.

The product of its digits is 3528, while the sum is 30.

The square root of 261172371 is about 16160.8282894164. The cubic root of 261172371 is about 639.2083073600.

The spelling of 261172371 in words is "two hundred sixty-one million, one hundred seventy-two thousand, three hundred seventy-one".