71315642 has 4 divisors (see below), whose sum is σ = 106973466. Its totient is φ = 35657820.

The previous prime is 71315641. The next prime is 71315653. The reversal of 71315642 is 24651317.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24651317 = 673 ⋅36629.

It can be written as a sum of positive squares in only one way, i.e., 54184321 + 17131321 = 7361^2 + 4139^2 .

It is not an unprimeable number, because it can be changed into a prime (71315641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17828909 + ... + 17828912.

Almost surely, 2^71315642 is an apocalyptic number.

71315642 is a deficient number, since it is larger than the sum of its proper divisors (35657824).

71315642 is a wasteful number, since it uses less digits than its factorization.

71315642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35657823.

The product of its digits is 5040, while the sum is 29.

The square root of 71315642 is about 8444.8589094194. The cubic root of 71315642 is about 414.6944903954.

Adding to 71315642 its reverse (24651317), we get a palindrome (95966959).

The spelling of 71315642 in words is "seventy-one million, three hundred fifteen thousand, six hundred forty-two".