261170731 has 4 divisors (see below), whose sum is σ = 264849264. Its totient is φ = 257492200.

The previous prime is 261170717. The next prime is 261170759. The reversal of 261170731 is 137071162.

261170731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 261170731 - 2¹⁵ = 261137963 is a prime.

It is a super-2 number, since 2×261170731² = 136420301462148722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261170731.

It is not an unprimeable number, because it can be changed into a prime (261179731) 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, 1839160 + ... + 1839301.

It is an arithmetic number, because the mean of its divisors is an integer number (66212316).

Almost surely, 2^261170731 is an apocalyptic number.

261170731 is a deficient number, since it is larger than the sum of its proper divisors (3678533).

261170731 is an equidigital number, since it uses as much as digits as its factorization.

261170731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3678532.

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 261170731 is about 16160.7775493631. Note that the first 3 decimals coincide. The cubic root of 261170731 is about 639.2069694137.

The spelling of 261170731 in words is "two hundred sixty-one million, one hundred seventy thousand, seven hundred thirty-one".