71131345 has 16 divisors (see below), whose sum is σ = 92952000. Its totient is φ = 52049088.

The previous prime is 71131343. The next prime is 71131369. The reversal of 71131345 is 54313117.

It is a cyclic number.

It is not a de Polignac number, because 71131345 - 2¹ = 71131343 is a prime.

It is a super-3 number, since 3×71131345³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (71131343) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10155 + ... + 15664.

It is an arithmetic number, because the mean of its divisors is an integer number (5809500).

Almost surely, 2^71131345 is an apocalyptic number.

It is an amenable number.

71131345 is a deficient number, since it is larger than the sum of its proper divisors (21820655).

71131345 is a wasteful number, since it uses less digits than its factorization.

71131345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25872.

The product of its digits is 1260, while the sum is 25.

The square root of 71131345 is about 8433.9400638136. The cubic root of 71131345 is about 414.3369583575.

The spelling of 71131345 in words is "seventy-one million, one hundred thirty-one thousand, three hundred forty-five".