91291477 has 2 divisors, whose sum is σ = 91291478. Its totient is φ = 91291476.

The previous prime is 91291463. The next prime is 91291511. The reversal of 91291477 is 77419219.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81613156 + 9678321 = 9034^2 + 3111^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91291477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91291427) 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, 45645738 + 45645739.

It is an arithmetic number, because the mean of its divisors is an integer number (45645739).

Almost surely, 2^91291477 is an apocalyptic number.

It is an amenable number.

91291477 is a deficient number, since it is larger than the sum of its proper divisors (1).

91291477 is an equidigital number, since it uses as much as digits as its factorization.

91291477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31752, while the sum is 40.

The square root of 91291477 is about 9554.6573460276. The cubic root of 91291477 is about 450.2738695035.

The spelling of 91291477 in words is "ninety-one million, two hundred ninety-one thousand, four hundred seventy-seven".