71840761 has 2 divisors, whose sum is σ = 71840762. Its totient is φ = 71840760.

The previous prime is 71840693. The next prime is 71840773. The reversal of 71840761 is 16704817.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62726400 + 9114361 = 7920^2 + 3019^2 .

It is a cyclic number.

It is not a de Polignac number, because 71840761 - 2⁷ = 71840633 is a prime.

It is a super-2 number, since 2×71840761² = 10322189882118242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71840261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35920380 + 35920381.

It is an arithmetic number, because the mean of its divisors is an integer number (35920381).

Almost surely, 2^71840761 is an apocalyptic number.

It is an amenable number.

71840761 is a deficient number, since it is larger than the sum of its proper divisors (1).

71840761 is an equidigital number, since it uses as much as digits as its factorization.

71840761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9408, while the sum is 34.

The square root of 71840761 is about 8475.8929323110. The cubic root of 71840761 is about 415.7098433536.

The spelling of 71840761 in words is "seventy-one million, eight hundred forty thousand, seven hundred sixty-one".