97209481 has 2 divisors, whose sum is σ = 97209482. Its totient is φ = 97209480.

The previous prime is 97209461. The next prime is 97209499. The reversal of 97209481 is 18490279.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96353856 + 855625 = 9816^2 + 925^2 .

It is an emirp because it is prime and its reverse (18490279) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97209481 - 2⁷ = 97209353 is a prime.

It is a super-2 number, since 2×97209481² = 18899366392578722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (97209461) 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, 48604740 + 48604741.

It is an arithmetic number, because the mean of its divisors is an integer number (48604741).

Almost surely, 2^97209481 is an apocalyptic number.

It is an amenable number.

97209481 is a deficient number, since it is larger than the sum of its proper divisors (1).

97209481 is an equidigital number, since it uses as much as digits as its factorization.

97209481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 97209481 is about 9859.4868527728. The cubic root of 97209481 is about 459.8006082911.

The spelling of 97209481 in words is "ninety-seven million, two hundred nine thousand, four hundred eighty-one".