155515105 has 4 divisors (see below), whose sum is σ = 186618132. Its totient is φ = 124412080.

The previous prime is 155515103. The next prime is 155515141. The reversal of 155515105 is 501515551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 501515551 = 31 ⋅16177921.

It can be written as a sum of positive squares in 2 ways, for example, as 108743184 + 46771921 = 10428^2 + 6839^2 .

It is not a de Polignac number, because 155515105 - 2¹ = 155515103 is a prime.

It is a super-2 number, since 2×155515105² = 48369895766322050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155515103) 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 3 ways as a sum of consecutive naturals, for example, 15551506 + ... + 15551515.

It is an arithmetic number, because the mean of its divisors is an integer number (46654533).

Almost surely, 2^155515105 is an apocalyptic number.

It is an amenable number.

155515105 is a deficient number, since it is larger than the sum of its proper divisors (31103027).

155515105 is an equidigital number, since it uses as much as digits as its factorization.

155515105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31103026.

The product of its (nonzero) digits is 3125, while the sum is 28.

The square root of 155515105 is about 12470.5695539538. The cubic root of 155515105 is about 537.7629274299.

The spelling of 155515105 in words is "one hundred fifty-five million, five hundred fifteen thousand, one hundred five".