155225215 has 16 divisors (see below), whose sum is σ = 203592960. Its totient is φ = 113103360.

The previous prime is 155225209. The next prime is 155225263. The reversal of 155225215 is 512522551.

It is not a de Polignac number, because 155225215 - 2⁹ = 155224703 is a prime.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 26820 + ... + 32089.

It is an arithmetic number, because the mean of its divisors is an integer number (12724560).

Almost surely, 2^155225215 is an apocalyptic number.

155225215 is a deficient number, since it is larger than the sum of its proper divisors (48367745).

155225215 is a wasteful number, since it uses less digits than its factorization.

155225215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58962.

The product of its digits is 5000, while the sum is 28.

The square root of 155225215 is about 12458.9411668889. The cubic root of 155225215 is about 537.4285782151.

Adding to 155225215 its reverse (512522551), we get a palindrome (667747766).

The spelling of 155225215 in words is "one hundred fifty-five million, two hundred twenty-five thousand, two hundred fifteen".