71242147 has 4 divisors (see below), whose sum is σ = 71259336. Its totient is φ = 71224960.

The previous prime is 71242117. The next prime is 71242163. The reversal of 71242147 is 74124217.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 71242147 - 2¹⁹ = 70717859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71242117) 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 3 ways as a sum of consecutive naturals, for example, 1872 + ... + 12082.

It is an arithmetic number, because the mean of its divisors is an integer number (17814834).

Almost surely, 2^71242147 is an apocalyptic number.

71242147 is a deficient number, since it is larger than the sum of its proper divisors (17189).

71242147 is a wasteful number, since it uses less digits than its factorization.

71242147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17188.

The product of its digits is 3136, while the sum is 28.

The square root of 71242147 is about 8440.5063236751. The cubic root of 71242147 is about 414.5519856727.

The spelling of 71242147 in words is "seventy-one million, two hundred forty-two thousand, one hundred forty-seven".