91541789 has 2 divisors, whose sum is σ = 91541790. Its totient is φ = 91541788.

The previous prime is 91541783. The next prime is 91541809. The reversal of 91541789 is 98714519.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89453764 + 2088025 = 9458^2 + 1445^2 .

It is a cyclic number.

It is not a de Polignac number, because 91541789 - 2⁴ = 91541773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91541783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45770894 + 45770895.

It is an arithmetic number, because the mean of its divisors is an integer number (45770895).

Almost surely, 2^91541789 is an apocalyptic number.

It is an amenable number.

91541789 is a deficient number, since it is larger than the sum of its proper divisors (1).

91541789 is an equidigital number, since it uses as much as digits as its factorization.

91541789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 44.

The square root of 91541789 is about 9567.7473315300. The cubic root of 91541789 is about 450.6850290881.

The spelling of 91541789 in words is "ninety-one million, five hundred forty-one thousand, seven hundred eighty-nine".