71131957 has 8 divisors (see below), whose sum is σ = 77747936. Its totient is φ = 64679472.

The previous prime is 71131937. The next prime is 71131969. The reversal of 71131957 is 75913117.

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

It is not a de Polignac number, because 71131957 - 2⁷ = 71131829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71131937) 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, 39963 + ... + 41704.

It is an arithmetic number, because the mean of its divisors is an integer number (9718492).

Almost surely, 2^71131957 is an apocalyptic number.

It is an amenable number.

71131957 is a deficient number, since it is larger than the sum of its proper divisors (6615979).

71131957 is a wasteful number, since it uses less digits than its factorization.

71131957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81747.

The product of its digits is 6615, while the sum is 34.

The square root of 71131957 is about 8433.9763457102. The cubic root of 71131957 is about 414.3381466451.

The spelling of 71131957 in words is "seventy-one million, one hundred thirty-one thousand, nine hundred fifty-seven".