91122001 has 2 divisors, whose sum is σ = 91122002. Its totient is φ = 91122000.

The previous prime is 91121981. The next prime is 91122011. The reversal of 91122001 is 10022119.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51494976 + 39627025 = 7176^2 + 6295^2 .

It is an emirp because it is prime and its reverse (10022119) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91122001 - 2⁹ = 91121489 is a prime.

It is not a weakly prime, because it can be changed into another prime (91122011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45561000 + 45561001.

It is an arithmetic number, because the mean of its divisors is an integer number (45561001).

Almost surely, 2^91122001 is an apocalyptic number.

It is an amenable number.

91122001 is a deficient number, since it is larger than the sum of its proper divisors (1).

91122001 is an equidigital number, since it uses as much as digits as its factorization.

91122001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 91122001 is about 9545.7844622640. The cubic root of 91122001 is about 449.9950633203.

The spelling of 91122001 in words is "ninety-one million, one hundred twenty-two thousand, one".