91039477 has 2 divisors, whose sum is σ = 91039478. Its totient is φ = 91039476.

The previous prime is 91039453. The next prime is 91039519. The reversal of 91039477 is 77493019.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88247236 + 2792241 = 9394^2 + 1671^2 .

It is a cyclic number.

It is not a de Polignac number, because 91039477 - 2⁷ = 91039349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91039177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45519738 + 45519739.

It is an arithmetic number, because the mean of its divisors is an integer number (45519739).

Almost surely, 2^91039477 is an apocalyptic number.

It is an amenable number.

91039477 is a deficient number, since it is larger than the sum of its proper divisors (1).

91039477 is an equidigital number, since it uses as much as digits as its factorization.

91039477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 47628, while the sum is 40.

The square root of 91039477 is about 9541.4609468362. The cubic root of 91039477 is about 449.8591773348.

The spelling of 91039477 in words is "ninety-one million, thirty-nine thousand, four hundred seventy-seven".