71261971 has 8 divisors (see below), whose sum is σ = 77925888. Its totient is φ = 64629000.

The previous prime is 71261959. The next prime is 71261999. The reversal of 71261971 is 17916217.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71261971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71261921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2775 + ... + 12256.

It is an arithmetic number, because the mean of its divisors is an integer number (9740736).

Almost surely, 2^71261971 is an apocalyptic number.

71261971 is a deficient number, since it is larger than the sum of its proper divisors (6663917).

71261971 is a wasteful number, since it uses less digits than its factorization.

71261971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15473.

The product of its digits is 5292, while the sum is 34.

The square root of 71261971 is about 8441.6805791264. The cubic root of 71261971 is about 414.5904334960.

The spelling of 71261971 in words is "seventy-one million, two hundred sixty-one thousand, nine hundred seventy-one".