91812001 has 2 divisors, whose sum is σ = 91812002. Its totient is φ = 91812000.

The previous prime is 91811989. The next prime is 91812013. The reversal of 91812001 is 10021819.

It is a balanced prime because it is at equal distance from previous prime (91811989) and next prime (91812013).

It can be written as a sum of positive squares in only one way, i.e., 91699776 + 112225 = 9576^2 + 335^2 .

It is an emirp because it is prime and its reverse (10021819) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91812001 - 2¹³ = 91803809 is a prime.

It is not a weakly prime, because it can be changed into another prime (91812031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45906000 + 45906001.

It is an arithmetic number, because the mean of its divisors is an integer number (45906001).

Almost surely, 2^91812001 is an apocalyptic number.

It is an amenable number.

91812001 is a deficient number, since it is larger than the sum of its proper divisors (1).

91812001 is an equidigital number, since it uses as much as digits as its factorization.

91812001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 91812001 is about 9581.8579096123. The cubic root of 91812001 is about 451.1280357815.

The spelling of 91812001 in words is "ninety-one million, eight hundred twelve thousand, one".