97720669 has 2 divisors, whose sum is σ = 97720670. Its totient is φ = 97720668.

The previous prime is 97720657. The next prime is 97720673. The reversal of 97720669 is 96602779.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95355225 + 2365444 = 9765^2 + 1538^2 .

It is a cyclic number.

It is not a de Polignac number, because 97720669 - 2⁹ = 97720157 is a prime.

It is a super-2 number, since 2×97720669² = 19098658299615122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97720769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48860334 + 48860335.

It is an arithmetic number, because the mean of its divisors is an integer number (48860335).

Almost surely, 2^97720669 is an apocalyptic number.

It is an amenable number.

97720669 is a deficient number, since it is larger than the sum of its proper divisors (1).

97720669 is an equidigital number, since it uses as much as digits as its factorization.

97720669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 285768, while the sum is 46.

The square root of 97720669 is about 9885.3765229252. The cubic root of 97720669 is about 460.6051723001.

It can be divided in two parts, 97720 and 669, that added together give a palindrome (98389).

The spelling of 97720669 in words is "ninety-seven million, seven hundred twenty thousand, six hundred sixty-nine".