91671739 has 2 divisors, whose sum is σ = 91671740. Its totient is φ = 91671738.

The previous prime is 91671733. The next prime is 91671763. The reversal of 91671739 is 93717619.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91671739 - 2³ = 91671731 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91671695 and 91671704.

It is not a weakly prime, because it can be changed into another prime (91671731) 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, 45835869 + 45835870.

It is an arithmetic number, because the mean of its divisors is an integer number (45835870).

Almost surely, 2^91671739 is an apocalyptic number.

91671739 is a deficient number, since it is larger than the sum of its proper divisors (1).

91671739 is an equidigital number, since it uses as much as digits as its factorization.

91671739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 71442, while the sum is 43.

The square root of 91671739 is about 9574.5359678681. The cubic root of 91671739 is about 450.8981879412.

The spelling of 91671739 in words is "ninety-one million, six hundred seventy-one thousand, seven hundred thirty-nine".