71685331 has 2 divisors, whose sum is σ = 71685332. Its totient is φ = 71685330.

The previous prime is 71685307. The next prime is 71685337. The reversal of 71685331 is 13358617.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71685331 - 2⁹ = 71684819 is a prime.

It is a super-2 number, since 2×71685331² = 10277573361159122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71685337) 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, 35842665 + 35842666.

It is an arithmetic number, because the mean of its divisors is an integer number (35842666).

Almost surely, 2^71685331 is an apocalyptic number.

71685331 is a deficient number, since it is larger than the sum of its proper divisors (1).

71685331 is an equidigital number, since it uses as much as digits as its factorization.

71685331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 34.

The square root of 71685331 is about 8466.7190221478. The cubic root of 71685331 is about 415.4098259531.

The spelling of 71685331 in words is "seventy-one million, six hundred eighty-five thousand, three hundred thirty-one".