280661153 has 4 divisors (see below), whose sum is σ = 281558148. Its totient is φ = 279764160.

The previous prime is 280661131. The next prime is 280661221. The reversal of 280661153 is 351166082.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 868624 + 279792529 = 932^2 + 16727^2 .

It is a cyclic number.

It is not a de Polignac number, because 280661153 - 2¹² = 280657057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (280661753) 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, 448028 + ... + 448653.

It is an arithmetic number, because the mean of its divisors is an integer number (70389537).

Almost surely, 2^280661153 is an apocalyptic number.

It is an amenable number.

280661153 is a deficient number, since it is larger than the sum of its proper divisors (896995).

280661153 is an equidigital number, since it uses as much as digits as its factorization.

280661153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 896994.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 280661153 is about 16752.9446068445. The cubic root of 280661153 is about 654.7277799711.

The spelling of 280661153 in words is "two hundred eighty million, six hundred sixty-one thousand, one hundred fifty-three".