280471161 has 4 divisors (see below), whose sum is σ = 373961552. Its totient is φ = 186980772.

The previous prime is 280471159. The next prime is 280471181. The reversal of 280471161 is 161174082.

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 not a de Polignac number, because 280471161 - 2¹ = 280471159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (280471181) 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, 46745191 + ... + 46745196.

It is an arithmetic number, because the mean of its divisors is an integer number (93490388).

Almost surely, 2^280471161 is an apocalyptic number.

It is an amenable number.

280471161 is a deficient number, since it is larger than the sum of its proper divisors (93490391).

280471161 is an equidigital number, since it uses as much as digits as its factorization.

280471161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93490390.

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 280471161 is about 16747.2732407398. The cubic root of 280471161 is about 654.5800085171.

The spelling of 280471161 in words is "two hundred eighty million, four hundred seventy-one thousand, one hundred sixty-one".