261046789 has 4 divisors (see below), whose sum is σ = 266601024. Its totient is φ = 255492556.

The previous prime is 261046771. The next prime is 261046801. The reversal of 261046789 is 987640162.

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, and also an emirpimes, since its reverse is a distinct semiprime: 987640162 = 2 ⋅493820081.

It is a cyclic number.

It is not a de Polignac number, because 261046789 - 2⁹ = 261046277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261044789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2777047 + ... + 2777140.

It is an arithmetic number, because the mean of its divisors is an integer number (66650256).

Almost surely, 2^261046789 is an apocalyptic number.

It is an amenable number.

261046789 is a deficient number, since it is larger than the sum of its proper divisors (5554235).

261046789 is an equidigital number, since it uses as much as digits as its factorization.

261046789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5554234.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 261046789 is about 16156.9424397068. The cubic root of 261046789 is about 639.1058387273.

The spelling of 261046789 in words is "two hundred sixty-one million, forty-six thousand, seven hundred eighty-nine".