97421609 has 2 divisors, whose sum is σ = 97421610. Its totient is φ = 97421608.

The previous prime is 97421557. The next prime is 97421627. The reversal of 97421609 is 90612479.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50197225 + 47224384 = 7085^2 + 6872^2 .

It is a cyclic number.

It is not a de Polignac number, because 97421609 - 2¹⁶ = 97356073 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (97421669) 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, 48710804 + 48710805.

It is an arithmetic number, because the mean of its divisors is an integer number (48710805).

Almost surely, 2^97421609 is an apocalyptic number.

It is an amenable number.

97421609 is a deficient number, since it is larger than the sum of its proper divisors (1).

97421609 is an equidigital number, since it uses as much as digits as its factorization.

97421609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 97421609 is about 9870.2385482824. The cubic root of 97421609 is about 460.1348202804.

The spelling of 97421609 in words is "ninety-seven million, four hundred twenty-one thousand, six hundred nine".