1018505225 has 6 divisors (see below), whose sum is σ = 1262946510. Its totient is φ = 814804160.

The previous prime is 1018505183. The next prime is 1018505233. The reversal of 1018505225 is 5225058101.

It can be written as a sum of positive squares in 3 ways, for example, as 4910656 + 1013594569 = 2216^2 + 31837^2 .

It is not a de Polignac number, because 1018505225 - 2⁶ = 1018505161 is a prime.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 20370080 + ... + 20370129.

It is an arithmetic number, because the mean of its divisors is an integer number (210491085).

Almost surely, 2^1018505225 is an apocalyptic number.

It is an amenable number.

1018505225 is a deficient number, since it is larger than the sum of its proper divisors (244441285).

1018505225 is an equidigital number, since it uses as much as digits as its factorization.

1018505225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40740219 (or 40740214 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 29.

The square root of 1018505225 is about 31914.0286551228. The cubic root of 1018505225 is about 1006.1307454830.

The spelling of 1018505225 in words is "one billion, eighteen million, five hundred five thousand, two hundred twenty-five".