7971151 has 4 divisors (see below), whose sum is σ = 7988904. Its totient is φ = 7953400.

The previous prime is 7971149. The next prime is 7971157. The reversal of 7971151 is 1511797.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 7971151 - 2¹ = 7971149 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.

7971151 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7971157) 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, 8185 + ... + 9106.

It is an arithmetic number, because the mean of its divisors is an integer number (1997226).

Almost surely, 2^7971151 is an apocalyptic number.

7971151 is a deficient number, since it is larger than the sum of its proper divisors (17753).

7971151 is a wasteful number, since it uses less digits than its factorization.

7971151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17752.

The product of its digits is 2205, while the sum is 31.

The square root of 7971151 is about 2823.3226878981. The cubic root of 7971151 is about 199.7593021055.

The spelling of 7971151 in words is "seven million, nine hundred seventy-one thousand, one hundred fifty-one".