91649471 has 2 divisors, whose sum is σ = 91649472. Its totient is φ = 91649470.

The previous prime is 91649449. The next prime is 91649477. The reversal of 91649471 is 17494619.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91649471 - 2¹⁸ = 91387327 is a prime.

It is a super-3 number, since 3×91649471³ (a number of 25 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91649477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45824735 + 45824736.

It is an arithmetic number, because the mean of its divisors is an integer number (45824736).

Almost surely, 2^91649471 is an apocalyptic number.

91649471 is a deficient number, since it is larger than the sum of its proper divisors (1).

91649471 is an equidigital number, since it uses as much as digits as its factorization.

91649471 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 41.

The square root of 91649471 is about 9573.3730210412. The cubic root of 91649471 is about 450.8616757290.

The spelling of 91649471 in words is "ninety-one million, six hundred forty-nine thousand, four hundred seventy-one".