155217115 has 8 divisors (see below), whose sum is σ = 186348240. Its totient is φ = 124115232.

The previous prime is 155217113. The next prime is 155217121. The reversal of 155217115 is 511712551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 155217115 - 2¹ = 155217113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155217113) 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 7 ways as a sum of consecutive naturals, for example, 6877 + ... + 18913.

It is an arithmetic number, because the mean of its divisors is an integer number (23293530).

Almost surely, 2^155217115 is an apocalyptic number.

155217115 is a deficient number, since it is larger than the sum of its proper divisors (31131125).

155217115 is a wasteful number, since it uses less digits than its factorization.

155217115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14621.

The product of its digits is 1750, while the sum is 28.

The square root of 155217115 is about 12458.6160948959. The cubic root of 155217115 is about 537.4192299762.

Adding to 155217115 its reverse (511712551), we get a palindrome (666929666).

The spelling of 155217115 in words is "one hundred fifty-five million, two hundred seventeen thousand, one hundred fifteen".