155222225 has 12 divisors (see below), whose sum is σ = 194277744. Its totient is φ = 123015120.

The previous prime is 155222173. The next prime is 155222237. The reversal of 155222225 is 522222551.

It is not a de Polignac number, because 155222225 - 2¹⁰ = 155221201 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 155222194 and 155222203.

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, 26339 + ... + 31688.

It is an arithmetic number, because the mean of its divisors is an integer number (16189812).

Almost surely, 2^155222225 is an apocalyptic number.

It is an amenable number.

155222225 is a deficient number, since it is larger than the sum of its proper divisors (39055519).

155222225 is a wasteful number, since it uses less digits than its factorization.

155222225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58144 (or 58139 counting only the distinct ones).

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

The square root of 155222225 is about 12458.8211721655. The cubic root of 155222225 is about 537.4251274833.

Adding to 155222225 its reverse (522222551), we get a palindrome (677444776).

The spelling of 155222225 in words is "one hundred fifty-five million, two hundred twenty-two thousand, two hundred twenty-five".