71306641 has 4 divisors (see below), whose sum is σ = 81493312. Its totient is φ = 61119972.

The previous prime is 71306629. The next prime is 71306663. The reversal of 71306641 is 14660317.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 14660317 = 7 ⋅2094331.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71306641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71306611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5093325 + ... + 5093338.

It is an arithmetic number, because the mean of its divisors is an integer number (20373328).

Almost surely, 2^71306641 is an apocalyptic number.

It is an amenable number.

71306641 is a deficient number, since it is larger than the sum of its proper divisors (10186671).

71306641 is a wasteful number, since it uses less digits than its factorization.

71306641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10186670.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 71306641 is about 8444.3259648121. The cubic root of 71306641 is about 414.6770429741.

Adding to 71306641 its reverse (14660317), we get a palindrome (85966958).

The spelling of 71306641 in words is "seventy-one million, three hundred six thousand, six hundred forty-one".