291285361 has 12 divisors (see below), whose sum is σ = 316156716. Its totient is φ = 267438080.

The previous prime is 291285353. The next prime is 291285389. The reversal of 291285361 is 163582192.

It can be written as a sum of positive squares in 6 ways, for example, as 26214400 + 265070961 = 5120^2 + 16281^2 .

It is not a de Polignac number, because 291285361 - 2³ = 291285353 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 291285361.

It is not an unprimeable number, because it can be changed into a prime (291285161) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23481 + ... + 33673.

It is an arithmetic number, because the mean of its divisors is an integer number (26346393).

Almost surely, 2^291285361 is an apocalyptic number.

It is an amenable number.

291285361 is a deficient number, since it is larger than the sum of its proper divisors (24871355).

291285361 is a wasteful number, since it uses less digits than its factorization.

291285361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10292 (or 10251 counting only the distinct ones).

The product of its digits is 25920, while the sum is 37.

The square root of 291285361 is about 17067.0841387743. The cubic root of 291285361 is about 662.8870777503.

The spelling of 291285361 in words is "two hundred ninety-one million, two hundred eighty-five thousand, three hundred sixty-one".