91402121 has 2 divisors, whose sum is σ = 91402122. Its totient is φ = 91402120.

The previous prime is 91402111. The next prime is 91402139. The reversal of 91402121 is 12120419.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90992521 + 409600 = 9539^2 + 640^2 .

It is an emirp because it is prime and its reverse (12120419) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91402121 - 2⁶ = 91402057 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 91402093 and 91402102.

It is not a weakly prime, because it can be changed into another prime (91402111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45701060 + 45701061.

It is an arithmetic number, because the mean of its divisors is an integer number (45701061).

Almost surely, 2^91402121 is an apocalyptic number.

It is an amenable number.

91402121 is a deficient number, since it is larger than the sum of its proper divisors (1).

91402121 is an equidigital number, since it uses as much as digits as its factorization.

91402121 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 20.

The square root of 91402121 is about 9560.4456486086. The cubic root of 91402121 is about 450.4557046178.

The spelling of 91402121 in words is "ninety-one million, four hundred two thousand, one hundred twenty-one".