71243851951 has 4 divisors (see below), whose sum is σ = 71304693304. Its totient is φ = 71183010600.

The previous prime is 71243851937. The next prime is 71243852021. The reversal of 71243851951 is 15915834217.

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 71243851951 - 2⁷ = 71243851823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71243858951) 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, 30418920 + ... + 30421261.

It is an arithmetic number, because the mean of its divisors is an integer number (17826173326).

Almost surely, 2^71243851951 is an apocalyptic number.

71243851951 is a deficient number, since it is larger than the sum of its proper divisors (60841353).

71243851951 is a wasteful number, since it uses less digits than its factorization.

71243851951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60841352.

The product of its digits is 302400, while the sum is 46.

The spelling of 71243851951 in words is "seventy-one billion, two hundred forty-three million, eight hundred fifty-one thousand, nine hundred fifty-one".