91454021 has 2 divisors, whose sum is σ = 91454022. Its totient is φ = 91454020.

The previous prime is 91454017. The next prime is 91454053. The reversal of 91454021 is 12045419.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47761921 + 43692100 = 6911^2 + 6610^2 .

It is a cyclic number.

It is not a de Polignac number, because 91454021 - 2² = 91454017 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (96454021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45727010 + 45727011.

It is an arithmetic number, because the mean of its divisors is an integer number (45727011).

Almost surely, 2^91454021 is an apocalyptic number.

It is an amenable number.

91454021 is a deficient number, since it is larger than the sum of its proper divisors (1).

91454021 is an equidigital number, since it uses as much as digits as its factorization.

91454021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 91454021 is about 9563.1595720243. The cubic root of 91454021 is about 450.5409478166.

The spelling of 91454021 in words is "ninety-one million, four hundred fifty-four thousand, twenty-one".