91516407889 has 2 divisors, whose sum is σ = 91516407890. Its totient is φ = 91516407888.

The previous prime is 91516407833. The next prime is 91516407929. The reversal of 91516407889 is 98870461519.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87648563025 + 3867844864 = 296055^2 + 62192^2 .

It is a cyclic number.

It is not a de Polignac number, because 91516407889 - 2¹³ = 91516399697 is a prime.

It is not a weakly prime, because it can be changed into another prime (91516447889) 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, 45758203944 + 45758203945.

It is an arithmetic number, because the mean of its divisors is an integer number (45758203945).

Almost surely, 2^91516407889 is an apocalyptic number.

It is an amenable number.

91516407889 is a deficient number, since it is larger than the sum of its proper divisors (1).

91516407889 is an equidigital number, since it uses as much as digits as its factorization.

91516407889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4354560, while the sum is 58.

The spelling of 91516407889 in words is "ninety-one billion, five hundred sixteen million, four hundred seven thousand, eight hundred eighty-nine".