71144145 has 24 divisors (see below), whose sum is σ = 126187776. Its totient is φ = 37060128.

The previous prime is 71144137. The next prime is 71144149. The reversal of 71144145 is 54144117.

It is not a de Polignac number, because 71144145 - 2³ = 71144137 is a prime.

It is a super-2 number, since 2×71144145² = 10122978735562050, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71144149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16449 + ... + 20318.

It is an arithmetic number, because the mean of its divisors is an integer number (5257824).

Almost surely, 2^71144145 is an apocalyptic number.

It is an amenable number.

71144145 is a deficient number, since it is larger than the sum of its proper divisors (55043631).

71144145 is a wasteful number, since it uses less digits than its factorization.

71144145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36821 (or 36818 counting only the distinct ones).

The product of its digits is 2240, while the sum is 27.

The square root of 71144145 is about 8434.6988683651. The cubic root of 71144145 is about 414.3618100126.

It can be divided in two parts, 71144 and 145, that added together give a square (71289 = 267²).

The spelling of 71144145 in words is "seventy-one million, one hundred forty-four thousand, one hundred forty-five".