71242947 has 12 divisors (see below), whose sum is σ = 103241424. Its totient is φ = 47340720.

The previous prime is 71242943. The next prime is 71242961. The reversal of 71242947 is 74924217.

It is not a de Polignac number, because 71242947 - 2² = 71242943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71242943) 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 11 ways as a sum of consecutive naturals, for example, 9928 + ... + 15525.

It is an arithmetic number, because the mean of its divisors is an integer number (8603452).

Almost surely, 2^71242947 is an apocalyptic number.

71242947 is a deficient number, since it is larger than the sum of its proper divisors (31998477).

71242947 is a wasteful number, since it uses less digits than its factorization.

71242947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25770 (or 25767 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 71242947 is about 8440.5537140640. The cubic root of 71242947 is about 414.5535373776.

The spelling of 71242947 in words is "seventy-one million, two hundred forty-two thousand, nine hundred forty-seven".