155242025 has 6 divisors (see below), whose sum is σ = 192500142. Its totient is φ = 124193600.

The previous prime is 155242013. The next prime is 155242033. The reversal of 155242025 is 520242551.

It can be written as a sum of positive squares in 3 ways, for example, as 9388096 + 145853929 = 3064^2 + 12077^2 .

It is not a de Polignac number, because 155242025 - 2¹⁴ = 155225641 is a prime.

It is a super-2 number, since 2×155242025² = 48200172652201250, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 155241985 and 155242003.

It is an unprimeable number.

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, 3104816 + ... + 3104865.

It is an arithmetic number, because the mean of its divisors is an integer number (32083357).

Almost surely, 2^155242025 is an apocalyptic number.

It is an amenable number.

155242025 is a deficient number, since it is larger than the sum of its proper divisors (37258117).

155242025 is an equidigital number, since it uses as much as digits as its factorization.

155242025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6209691 (or 6209686 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 155242025 is about 12459.6157645411. The cubic root of 155242025 is about 537.4479776585.

Adding to 155242025 its reverse (520242551), we get a palindrome (675484576).

The spelling of 155242025 in words is "one hundred fifty-five million, two hundred forty-two thousand, twenty-five".