3971155 has 4 divisors (see below), whose sum is σ = 4765392. Its totient is φ = 3176920.

The previous prime is 3971153. The next prime is 3971167. The reversal of 3971155 is 5511793.

3971155 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.

It is not a de Polignac number, because 3971155 - 2¹ = 3971153 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3971153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 397111 + ... + 397120.

It is an arithmetic number, because the mean of its divisors is an integer number (1191348).

Almost surely, 2^3971155 is an apocalyptic number.

3971155 is a deficient number, since it is larger than the sum of its proper divisors (794237).

3971155 is an equidigital number, since it uses as much as digits as its factorization.

3971155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794236.

The product of its digits is 4725, while the sum is 31.

The square root of 3971155 is about 1992.7757023810. The cubic root of 3971155 is about 158.3576127741.

The spelling of 3971155 in words is "three million, nine hundred seventy-one thousand, one hundred fifty-five".