71442183781 has 2 divisors, whose sum is σ = 71442183782. Its totient is φ = 71442183780.

The previous prime is 71442183773. The next prime is 71442183797. The reversal of 71442183781 is 18738124417.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44139909025 + 27302274756 = 210095^2 + 165234^2 .

It is an emirp because it is prime and its reverse (18738124417) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71442183781 - 2³ = 71442183773 is a prime.

It is a super-2 number, since 2×71442183781² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71442183481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35721091890 + 35721091891.

It is an arithmetic number, because the mean of its divisors is an integer number (35721091891).

Almost surely, 2^71442183781 is an apocalyptic number.

It is an amenable number.

71442183781 is a deficient number, since it is larger than the sum of its proper divisors (1).

71442183781 is an equidigital number, since it uses as much as digits as its factorization.

71442183781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 301056, while the sum is 46.

The spelling of 71442183781 in words is "seventy-one billion, four hundred forty-two million, one hundred eighty-three thousand, seven hundred eighty-one".