91469869 has 2 divisors, whose sum is σ = 91469870. Its totient is φ = 91469868.

The previous prime is 91469813. The next prime is 91469897. The reversal of 91469869 is 96896419.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91431844 + 38025 = 9562^2 + 195^2 .

It is an emirp because it is prime and its reverse (96896419) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91469869 - 2¹¹ = 91467821 is a prime.

It is a super-2 number, since 2×91469869² = 16733473869754322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91469899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45734934 + 45734935.

It is an arithmetic number, because the mean of its divisors is an integer number (45734935).

Almost surely, 2^91469869 is an apocalyptic number.

It is an amenable number.

91469869 is a deficient number, since it is larger than the sum of its proper divisors (1).

91469869 is an equidigital number, since it uses as much as digits as its factorization.

91469869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 839808, while the sum is 52.

The square root of 91469869 is about 9563.9881325731. The cubic root of 91469869 is about 450.5669709499.

The spelling of 91469869 in words is "ninety-one million, four hundred sixty-nine thousand, eight hundred sixty-nine".