97785109 has 2 divisors, whose sum is σ = 97785110. Its totient is φ = 97785108.

The previous prime is 97785097. The next prime is 97785113. The reversal of 97785109 is 90158779.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66178225 + 31606884 = 8135^2 + 5622^2 .

It is an emirp because it is prime and its reverse (90158779) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97785109 - 2⁹ = 97784597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97785119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48892554 + 48892555.

It is an arithmetic number, because the mean of its divisors is an integer number (48892555).

Almost surely, 2^97785109 is an apocalyptic number.

It is an amenable number.

97785109 is a deficient number, since it is larger than the sum of its proper divisors (1).

97785109 is an equidigital number, since it uses as much as digits as its factorization.

97785109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 158760, while the sum is 46.

The square root of 97785109 is about 9888.6353456885. The cubic root of 97785109 is about 460.7063957694.

The spelling of 97785109 in words is "ninety-seven million, seven hundred eighty-five thousand, one hundred nine".