280961189 has 4 divisors (see below), whose sum is σ = 295748640. Its totient is φ = 266173740.

The previous prime is 280961171. The next prime is 280961201. The reversal of 280961189 is 981169082.

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 280961189 - 2²⁰ = 279912613 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 (280961489) 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, 7393697 + ... + 7393734.

It is an arithmetic number, because the mean of its divisors is an integer number (73937160).

Almost surely, 2^280961189 is an apocalyptic number.

It is an amenable number.

280961189 is a deficient number, since it is larger than the sum of its proper divisors (14787451).

280961189 is a wasteful number, since it uses less digits than its factorization.

280961189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14787450.

The product of its (nonzero) digits is 62208, while the sum is 44.

The square root of 280961189 is about 16761.8969391892. The cubic root of 280961189 is about 654.9610053898.

The spelling of 280961189 in words is "two hundred eighty million, nine hundred sixty-one thousand, one hundred eighty-nine".