261712073 has 4 divisors (see below), whose sum is σ = 299099520. Its totient is φ = 224324628.

The previous prime is 261712067. The next prime is 261712103. The reversal of 261712073 is 370217162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261712073 - 2⁴ = 261712057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (261712043) 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, 18693713 + ... + 18693726.

It is an arithmetic number, because the mean of its divisors is an integer number (74774880).

Almost surely, 2^261712073 is an apocalyptic number.

It is an amenable number.

261712073 is a deficient number, since it is larger than the sum of its proper divisors (37387447).

261712073 is an equidigital number, since it uses as much as digits as its factorization.

261712073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37387446.

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 261712073 is about 16177.5175166031. The cubic root of 261712073 is about 639.6483036769.

The spelling of 261712073 in words is "two hundred sixty-one million, seven hundred twelve thousand, seventy-three".