91869601 has 2 divisors, whose sum is σ = 91869602. Its totient is φ = 91869600.

The previous prime is 91869587. The next prime is 91869619. The reversal of 91869601 is 10696819.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80640400 + 11229201 = 8980^2 + 3351^2 .

It is a cyclic number.

It is not a de Polignac number, because 91869601 - 2⁷ = 91869473 is a prime.

It is not a weakly prime, because it can be changed into another prime (91869671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45934800 + 45934801.

It is an arithmetic number, because the mean of its divisors is an integer number (45934801).

Almost surely, 2^91869601 is an apocalyptic number.

It is an amenable number.

91869601 is a deficient number, since it is larger than the sum of its proper divisors (1).

91869601 is an equidigital number, since it uses as much as digits as its factorization.

91869601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 91869601 is about 9584.8631184801. The cubic root of 91869601 is about 451.2223573023. Note that the first 3 decimals are identical.

It can be divided in two parts, 9186960 and 1, that added together give a square (9186961 = 3031²).

The spelling of 91869601 in words is "ninety-one million, eight hundred sixty-nine thousand, six hundred one".