91038539 has 2 divisors, whose sum is σ = 91038540. Its totient is φ = 91038538.

The previous prime is 91038533. The next prime is 91038583. The reversal of 91038539 is 93583019.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91038539 - 2⁴ = 91038523 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91038533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45519269 + 45519270.

It is an arithmetic number, because the mean of its divisors is an integer number (45519270).

Almost surely, 2^91038539 is an apocalyptic number.

91038539 is a deficient number, since it is larger than the sum of its proper divisors (1).

91038539 is an equidigital number, since it uses as much as digits as its factorization.

91038539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 91038539 is about 9541.4117928114. The cubic root of 91038539 is about 449.8576323298.

The spelling of 91038539 in words is "ninety-one million, thirty-eight thousand, five hundred thirty-nine".