78971171 has 4 divisors (see below), whose sum is σ = 83616552. Its totient is φ = 74325792.

The previous prime is 78971159. The next prime is 78971183. The reversal of 78971171 is 17117987.

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

It is an interprime number because it is at equal distance from previous prime (78971159) and next prime (78971183).

It is a cyclic number.

It is not a de Polignac number, because 78971171 - 2⁶ = 78971107 is a prime.

It is a super-2 number, since 2×78971171² = 12472891698222482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78971131) 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, 2322665 + ... + 2322698.

It is an arithmetic number, because the mean of its divisors is an integer number (20904138).

Almost surely, 2^78971171 is an apocalyptic number.

78971171 is a deficient number, since it is larger than the sum of its proper divisors (4645381).

78971171 is a wasteful number, since it uses less digits than its factorization.

78971171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4645380.

The product of its digits is 24696, while the sum is 41.

The square root of 78971171 is about 8886.5725113792. The cubic root of 78971171 is about 429.0318419900.

The spelling of 78971171 in words is "seventy-eight million, nine hundred seventy-one thousand, one hundred seventy-one".