91659015908281 has 2 divisors, whose sum is σ = 91659015908282. Its totient is φ = 91659015908280.

The previous prime is 91659015908233. The next prime is 91659015908303. The reversal of 91659015908281 is 18280951095619.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66921234691600 + 24737781216681 = 8180540^2 + 4973709^2 .

It is a cyclic number.

It is not a de Polignac number, because 91659015908281 - 2¹⁵ = 91659015875513 is a prime.

It is a super-2 number, since 2×91659015908281² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91659015900281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45829507954140 + 45829507954141.

It is an arithmetic number, because the mean of its divisors is an integer number (45829507954141).

Almost surely, 2^{91659015908281} is an apocalyptic number.

It is an amenable number.

91659015908281 is a deficient number, since it is larger than the sum of its proper divisors (1).

91659015908281 is an equidigital number, since it uses as much as digits as its factorization.

91659015908281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13996800, while the sum is 64.

The spelling of 91659015908281 in words is "ninety-one trillion, six hundred fifty-nine billion, fifteen million, nine hundred eight thousand, two hundred eighty-one".