242161225 has 12 divisors (see below), whose sum is σ = 300481884. Its totient is φ = 193598720.

The previous prime is 242161219. The next prime is 242161259. The reversal of 242161225 is 522161242.

It can be written as a sum of positive squares in 6 ways, for example, as 1042441 + 241118784 = 1021^2 + 15528^2 .

It is not a de Polignac number, because 242161225 - 2⁷ = 242161097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

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 242161225.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55317 + ... + 59533.

It is an arithmetic number, because the mean of its divisors is an integer number (25040157).

Almost surely, 2^242161225 is an apocalyptic number.

242161225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

242161225 is a deficient number, since it is larger than the sum of its proper divisors (58320659).

242161225 is a wasteful number, since it uses less digits than its factorization.

242161225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6524 (or 6519 counting only the distinct ones).

The product of its digits is 1920, while the sum is 25.

The square root of 242161225 is about 15561.5302910736. The cubic root of 242161225 is about 623.3063264979.

The spelling of 242161225 in words is "two hundred forty-two million, one hundred sixty-one thousand, two hundred twenty-five".