91447669 has 2 divisors, whose sum is σ = 91447670. Its totient is φ = 91447668.

The previous prime is 91447661. The next prime is 91447693. The reversal of 91447669 is 96674419.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89529444 + 1918225 = 9462^2 + 1385^2 .

It is a cyclic number.

It is not a de Polignac number, because 91447669 - 2³ = 91447661 is a prime.

It is a super-2 number, since 2×91447669² = 16725352331067122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91447661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45723834 + 45723835.

It is an arithmetic number, because the mean of its divisors is an integer number (45723835).

Almost surely, 2^91447669 is an apocalyptic number.

It is an amenable number.

91447669 is a deficient number, since it is larger than the sum of its proper divisors (1).

91447669 is an equidigital number, since it uses as much as digits as its factorization.

91447669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 46.

The square root of 91447669 is about 9562.8274584455. The cubic root of 91447669 is about 450.5305167011.

The spelling of 91447669 in words is "ninety-one million, four hundred forty-seven thousand, six hundred sixty-nine".