97170809 has 2 divisors, whose sum is σ = 97170810. Its totient is φ = 97170808.

The previous prime is 97170781. The next prime is 97170863. The reversal of 97170809 is 90807179.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76038400 + 21132409 = 8720^2 + 4597^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97170809 is a prime.

It is a super-2 number, since 2×97170809² = 18884332243428962, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (97175809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48585404 + 48585405.

It is an arithmetic number, because the mean of its divisors is an integer number (48585405).

Almost surely, 2^97170809 is an apocalyptic number.

It is an amenable number.

97170809 is a deficient number, since it is larger than the sum of its proper divisors (1).

97170809 is an equidigital number, since it uses as much as digits as its factorization.

97170809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 41.

The square root of 97170809 is about 9857.5255008547. The cubic root of 97170809 is about 459.7396273820.

It can be divided in two parts, 97170 and 809, that added together give a palindrome (97979).

The spelling of 97170809 in words is "ninety-seven million, one hundred seventy thousand, eight hundred nine".