155228115 has 32 divisors (see below), whose sum is σ = 288668160. Its totient is φ = 69755904.

The previous prime is 155228113. The next prime is 155228131. The reversal of 155228115 is 511822551.

It is not a de Polignac number, because 155228115 - 2¹ = 155228113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155228113) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 6334 + ... + 18723.

It is an arithmetic number, because the mean of its divisors is an integer number (9020880).

Almost surely, 2^155228115 is an apocalyptic number.

155228115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

155228115 is a deficient number, since it is larger than the sum of its proper divisors (133440045).

155228115 is a wasteful number, since it uses less digits than its factorization.

155228115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25131.

The product of its digits is 4000, while the sum is 30.

The square root of 155228115 is about 12459.0575486270. The cubic root of 155228115 is about 537.4319250364.

The spelling of 155228115 in words is "one hundred fifty-five million, two hundred twenty-eight thousand, one hundred fifteen".