71555145 has 8 divisors (see below), whose sum is σ = 114488256. Its totient is φ = 38162736.

The previous prime is 71555137. The next prime is 71555147. The reversal of 71555145 is 54155517.

It is a happy number.

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

It is not a de Polignac number, because 71555145 - 2³ = 71555137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71555147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2385157 + ... + 2385186.

It is an arithmetic number, because the mean of its divisors is an integer number (14311032).

Almost surely, 2^71555145 is an apocalyptic number.

It is an amenable number.

71555145 is a deficient number, since it is larger than the sum of its proper divisors (42933111).

71555145 is a wasteful number, since it uses less digits than its factorization.

71555145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4770351.

The product of its digits is 17500, while the sum is 33.

The square root of 71555145 is about 8459.0274263653. The cubic root of 71555145 is about 415.1582016480.

The spelling of 71555145 in words is "seventy-one million, five hundred fifty-five thousand, one hundred forty-five".