261456189 has 4 divisors (see below), whose sum is σ = 348608256. Its totient is φ = 174304124.

The previous prime is 261456163. The next prime is 261456197. The reversal of 261456189 is 981654162.

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 261456189 - 2⁷ = 261456061 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 261456189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261456119) 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, 43576029 + ... + 43576034.

It is an arithmetic number, because the mean of its divisors is an integer number (87152064).

Almost surely, 2^261456189 is an apocalyptic number.

It is an amenable number.

261456189 is a deficient number, since it is larger than the sum of its proper divisors (87152067).

261456189 is an equidigital number, since it uses as much as digits as its factorization.

261456189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87152066.

The product of its digits is 103680, while the sum is 42.

The square root of 261456189 is about 16169.6069525514. The cubic root of 261456189 is about 639.4397677118.

The spelling of 261456189 in words is "two hundred sixty-one million, four hundred fifty-six thousand, one hundred eighty-nine".