71461332181 has 2 divisors, whose sum is σ = 71461332182. Its totient is φ = 71461332180.

The previous prime is 71461332169. The next prime is 71461332191. The reversal of 71461332181 is 18123316417.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41448888100 + 30012444081 = 203590^2 + 173241^2 .

It is a cyclic number.

It is not a de Polignac number, because 71461332181 - 2¹⁷ = 71461201109 is a prime.

It is a super-2 number, since 2×71461332181² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 71461332181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71461332191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35730666090 + 35730666091.

It is an arithmetic number, because the mean of its divisors is an integer number (35730666091).

Almost surely, 2^71461332181 is an apocalyptic number.

It is an amenable number.

71461332181 is a deficient number, since it is larger than the sum of its proper divisors (1).

71461332181 is an equidigital number, since it uses as much as digits as its factorization.

71461332181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 37.

Adding to 71461332181 its reverse (18123316417), we get a palindrome (89584648598).

The spelling of 71461332181 in words is "seventy-one billion, four hundred sixty-one million, three hundred thirty-two thousand, one hundred eighty-one".