155115985 has 8 divisors (see below), whose sum is σ = 189191016. Its totient is φ = 122058240.

The previous prime is 155115967. The next prime is 155115991. The reversal of 155115985 is 589511551.

It can be written as a sum of positive squares in 4 ways, for example, as 3530641 + 151585344 = 1879^2 + 12312^2 .

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

It is not a de Polignac number, because 155115985 - 2⁵ = 155115953 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 253984 + ... + 254593.

It is an arithmetic number, because the mean of its divisors is an integer number (23648877).

Almost surely, 2^155115985 is an apocalyptic number.

It is an amenable number.

155115985 is a deficient number, since it is larger than the sum of its proper divisors (34075031).

155115985 is an equidigital number, since it uses as much as digits as its factorization.

155115985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508643.

The product of its digits is 45000, while the sum is 40.

The square root of 155115985 is about 12454.5567966106. The cubic root of 155115985 is about 537.3024880938.

The spelling of 155115985 in words is "one hundred fifty-five million, one hundred fifteen thousand, nine hundred eighty-five".