71242145 has 16 divisors (see below), whose sum is σ = 92316672. Its totient is φ = 52466880.

The previous prime is 71242117. The next prime is 71242163. The reversal of 71242145 is 54124217.

It is not a de Polignac number, because 71242145 - 2²⁰ = 70193569 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26744 + ... + 29286.

It is an arithmetic number, because the mean of its divisors is an integer number (5769792).

Almost surely, 2^71242145 is an apocalyptic number.

It is an amenable number.

71242145 is a deficient number, since it is larger than the sum of its proper divisors (21074527).

71242145 is a wasteful number, since it uses less digits than its factorization.

71242145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2992.

The product of its digits is 2240, while the sum is 26.

The square root of 71242145 is about 8440.5062051988. The cubic root of 71242145 is about 414.5519817935.

The spelling of 71242145 in words is "seventy-one million, two hundred forty-two thousand, one hundred forty-five".