8156971 has 4 divisors (see below), whose sum is σ = 8346712. Its totient is φ = 7967232.

The previous prime is 8156969. The next prime is 8156989. The reversal of 8156971 is 1796518.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1796518 = 2 ⋅898259.

It is a cyclic number.

It is not a de Polignac number, because 8156971 - 2¹ = 8156969 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8156971.

It is not an unprimeable number, because it can be changed into a prime (8156471) 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, 94806 + ... + 94891.

It is an arithmetic number, because the mean of its divisors is an integer number (2086678).

Almost surely, 2^8156971 is an apocalyptic number.

8156971 is a deficient number, since it is larger than the sum of its proper divisors (189741).

8156971 is a wasteful number, since it uses less digits than its factorization.

8156971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189740.

The product of its digits is 15120, while the sum is 37.

The square root of 8156971 is about 2856.0411411603. The cubic root of 8156971 is about 201.2996282067.

The spelling of 8156971 in words is "eight million, one hundred fifty-six thousand, nine hundred seventy-one".