91818049 has 2 divisors, whose sum is σ = 91818050. Its totient is φ = 91818048.

The previous prime is 91818043. The next prime is 91818137. The reversal of 91818049 is 94081819.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68227600 + 23590449 = 8260^2 + 4857^2 .

It is a cyclic number.

It is not a de Polignac number, because 91818049 - 2²⁵ = 58263617 is a prime.

It is not a weakly prime, because it can be changed into another prime (91818043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45909024 + 45909025.

It is an arithmetic number, because the mean of its divisors is an integer number (45909025).

Almost surely, 2^91818049 is an apocalyptic number.

It is an amenable number.

91818049 is a deficient number, since it is larger than the sum of its proper divisors (1).

91818049 is an equidigital number, since it uses as much as digits as its factorization.

91818049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 91818049 is about 9582.1735008295. The cubic root of 91818049 is about 451.1379413945.

The spelling of 91818049 in words is "ninety-one million, eight hundred eighteen thousand, forty-nine".