97371809 has 2 divisors, whose sum is σ = 97371810. Its totient is φ = 97371808.

The previous prime is 97371797. The next prime is 97371817. The reversal of 97371809 is 90817379.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81848209 + 15523600 = 9047^2 + 3940^2 .

It is an emirp because it is prime and its reverse (90817379) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97371809 - 2¹² = 97367713 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 97371809.

It is not a weakly prime, because it can be changed into another prime (97371509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48685904 + 48685905.

It is an arithmetic number, because the mean of its divisors is an integer number (48685905).

Almost surely, 2^97371809 is an apocalyptic number.

It is an amenable number.

97371809 is a deficient number, since it is larger than the sum of its proper divisors (1).

97371809 is an equidigital number, since it uses as much as digits as its factorization.

97371809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 97371809 is about 9867.7154904263. The cubic root of 97371809 is about 460.0564029767.

The spelling of 97371809 in words is "ninety-seven million, three hundred seventy-one thousand, eight hundred nine".