71255645 has 4 divisors (see below), whose sum is σ = 85506780. Its totient is φ = 57004512.

The previous prime is 71255641. The next prime is 71255647. The reversal of 71255645 is 54655217.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54655217 = 139 ⋅393203.

It can be written as a sum of positive squares in 2 ways, for example, as 36457444 + 34798201 = 6038^2 + 5899^2 .

It is a cyclic number.

It is not a de Polignac number, because 71255645 - 2² = 71255641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71255641) 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, 7125560 + ... + 7125569.

It is an arithmetic number, because the mean of its divisors is an integer number (21376695).

Almost surely, 2^71255645 is an apocalyptic number.

It is an amenable number.

71255645 is a deficient number, since it is larger than the sum of its proper divisors (14251135).

71255645 is a wasteful number, since it uses less digits than its factorization.

71255645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14251134.

The product of its digits is 42000, while the sum is 35.

The square root of 71255645 is about 8441.3058823857. The cubic root of 71255645 is about 414.5781652569.

The spelling of 71255645 in words is "seventy-one million, two hundred fifty-five thousand, six hundred forty-five".