291284225 has 6 divisors (see below), whose sum is σ = 361192470. Its totient is φ = 233027360.

The previous prime is 291284221. The next prime is 291284261. The reversal of 291284225 is 522482192.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 4963984 + 286320241 = 2228^2 + 16921^2 .

It is not a de Polignac number, because 291284225 - 2² = 291284221 is a prime.

It is not an unprimeable number, because it can be changed into a prime (291284221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5825660 + ... + 5825709.

It is an arithmetic number, because the mean of its divisors is an integer number (60198745).

Almost surely, 2^291284225 is an apocalyptic number.

291284225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

291284225 is a deficient number, since it is larger than the sum of its proper divisors (69908245).

291284225 is a wasteful number, since it uses less digits than its factorization.

291284225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11651379 (or 11651374 counting only the distinct ones).

The product of its digits is 23040, while the sum is 35.

The square root of 291284225 is about 17067.0508583059. The cubic root of 291284225 is about 662.8862160057.

The spelling of 291284225 in words is "two hundred ninety-one million, two hundred eighty-four thousand, two hundred twenty-five".