71681377 has 2 divisors, whose sum is σ = 71681378. Its totient is φ = 71681376.

The previous prime is 71681341. The next prime is 71681381. The reversal of 71681377 is 77318617.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59737441 + 11943936 = 7729^2 + 3456^2 .

It is a cyclic number.

It is not a de Polignac number, because 71681377 - 2¹⁵ = 71648609 is a prime.

It is a super-2 number, since 2×71681377² = 10276439617232258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71681177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35840688 + 35840689.

It is an arithmetic number, because the mean of its divisors is an integer number (35840689).

Almost surely, 2^71681377 is an apocalyptic number.

It is an amenable number.

71681377 is a deficient number, since it is larger than the sum of its proper divisors (1).

71681377 is an equidigital number, since it uses as much as digits as its factorization.

71681377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 49392, while the sum is 40.

The square root of 71681377 is about 8466.4855164348. The cubic root of 71681377 is about 415.4021881252.

The spelling of 71681377 in words is "seventy-one million, six hundred eighty-one thousand, three hundred seventy-seven".