71280971 has 4 divisors (see below), whose sum is σ = 72938712. Its totient is φ = 69623232.

The previous prime is 71280967. The next prime is 71280973. The reversal of 71280971 is 17908217.

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 71280971 - 2² = 71280967 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71280973) 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, 828806 + ... + 828891.

It is an arithmetic number, because the mean of its divisors is an integer number (18234678).

Almost surely, 2^71280971 is an apocalyptic number.

71280971 is a deficient number, since it is larger than the sum of its proper divisors (1657741).

71280971 is a wasteful number, since it uses less digits than its factorization.

71280971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1657740.

The product of its (nonzero) digits is 7056, while the sum is 35.

The square root of 71280971 is about 8442.8058724573. The cubic root of 71280971 is about 414.6272765141.

The spelling of 71280971 in words is "seventy-one million, two hundred eighty thousand, nine hundred seventy-one".