155315515 has 4 divisors (see below), whose sum is σ = 186378624. Its totient is φ = 124252408.

The previous prime is 155315513. The next prime is 155315521. The reversal of 155315515 is 515513551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 515513551 = 7 ⋅73644793.

It is a cyclic number.

It is not a de Polignac number, because 155315515 - 2¹ = 155315513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155315513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15531547 + ... + 15531556.

It is an arithmetic number, because the mean of its divisors is an integer number (46594656).

Almost surely, 2^155315515 is an apocalyptic number.

155315515 is a deficient number, since it is larger than the sum of its proper divisors (31063109).

155315515 is an equidigital number, since it uses as much as digits as its factorization.

155315515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31063108.

The product of its digits is 9375, while the sum is 31.

The square root of 155315515 is about 12462.5645434638. The cubic root of 155315515 is about 537.5327717534.

The spelling of 155315515 in words is "one hundred fifty-five million, three hundred fifteen thousand, five hundred fifteen".