71899687 has 2 divisors, whose sum is σ = 71899688. Its totient is φ = 71899686.

The previous prime is 71899673. The next prime is 71899693. The reversal of 71899687 is 78699817.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71899687 - 2¹⁵ = 71866919 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71899657) 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, 35949843 + 35949844.

It is an arithmetic number, because the mean of its divisors is an integer number (35949844).

Almost surely, 2^71899687 is an apocalyptic number.

71899687 is a deficient number, since it is larger than the sum of its proper divisors (1).

71899687 is an equidigital number, since it uses as much as digits as its factorization.

71899687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1524096, while the sum is 55.

The square root of 71899687 is about 8479.3683137366. The cubic root of 71899687 is about 415.8234716219.

The spelling of 71899687 in words is "seventy-one million, eight hundred ninety-nine thousand, six hundred eighty-seven".