9975155 has 4 divisors (see below), whose sum is σ = 11970192. Its totient is φ = 7980120.

The previous prime is 9975131. The next prime is 9975157. The reversal of 9975155 is 5515799.

9975155 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5515799 = 31 ⋅177929.

It is not a de Polignac number, because 9975155 - 2¹⁰ = 9974131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9975157) 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, 997511 + ... + 997520.

It is an arithmetic number, because the mean of its divisors is an integer number (2992548).

Almost surely, 2^9975155 is an apocalyptic number.

9975155 is a deficient number, since it is larger than the sum of its proper divisors (1995037).

9975155 is a wasteful number, since it uses less digits than its factorization.

9975155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1995036.

The product of its digits is 70875, while the sum is 41.

The square root of 9975155 is about 3158.3468777194. The cubic root of 9975155 is about 215.2648979353.

The spelling of 9975155 in words is "nine million, nine hundred seventy-five thousand, one hundred fifty-five".