71180381 has 2 divisors, whose sum is σ = 71180382. Its totient is φ = 71180380.

The previous prime is 71180357. The next prime is 71180383. The reversal of 71180381 is 18308117.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50623225 + 20557156 = 7115^2 + 4534^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71180381 is a prime.

It is a super-2 number, since 2×71180381² = 10133293278610322, which contains 22 as substring.

Together with 71180383, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71180383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35590190 + 35590191.

It is an arithmetic number, because the mean of its divisors is an integer number (35590191).

Almost surely, 2^71180381 is an apocalyptic number.

It is an amenable number.

71180381 is a deficient number, since it is larger than the sum of its proper divisors (1).

71180381 is an equidigital number, since it uses as much as digits as its factorization.

71180381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 29.

The square root of 71180381 is about 8436.8466265543. The cubic root of 71180381 is about 414.4321473355.

Adding to 71180381 its reverse (18308117), we get a palindrome (89488498).

The spelling of 71180381 in words is "seventy-one million, one hundred eighty thousand, three hundred eighty-one".