261712371 has 4 divisors (see below), whose sum is σ = 348949832. Its totient is φ = 174474912.

The previous prime is 261712351. The next prime is 261712393. The reversal of 261712371 is 173217162.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 261712371 - 2⁹ = 261711859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261712351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43618726 + ... + 43618731.

It is an arithmetic number, because the mean of its divisors is an integer number (87237458).

Almost surely, 2^261712371 is an apocalyptic number.

261712371 is a deficient number, since it is larger than the sum of its proper divisors (87237461).

261712371 is an equidigital number, since it uses as much as digits as its factorization.

261712371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87237460.

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

The square root of 261712371 is about 16177.5267269135. The cubic root of 261712371 is about 639.6485464565.

The spelling of 261712371 in words is "two hundred sixty-one million, seven hundred twelve thousand, three hundred seventy-one".