90681719 has 2 divisors, whose sum is σ = 90681720. Its totient is φ = 90681718.

The previous prime is 90681677. The next prime is 90681743. The reversal of 90681719 is 91718609.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90681719 is a prime.

It is a super-2 number, since 2×90681719² = 16446348321589922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90681769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45340859 + 45340860.

It is an arithmetic number, because the mean of its divisors is an integer number (45340860).

Almost surely, 2^90681719 is an apocalyptic number.

90681719 is a deficient number, since it is larger than the sum of its proper divisors (1).

90681719 is an equidigital number, since it uses as much as digits as its factorization.

90681719 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 90681719 is about 9522.6949441847. The cubic root of 90681719 is about 449.2691329472.

The spelling of 90681719 in words is "ninety million, six hundred eighty-one thousand, seven hundred nineteen".