97720769 has 2 divisors, whose sum is σ = 97720770. Its totient is φ = 97720768.

The previous prime is 97720751. The next prime is 97720783. The reversal of 97720769 is 96702779.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55950400 + 41770369 = 7480^2 + 6463^2 .

It is an emirp because it is prime and its reverse (96702779) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97720769 is a prime.

It is a super-2 number, since 2×97720769² = 19098697387902722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (97720669) 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, 48860384 + 48860385.

It is an arithmetic number, because the mean of its divisors is an integer number (48860385).

Almost surely, 2^97720769 is an apocalyptic number.

It is an amenable number.

97720769 is a deficient number, since it is larger than the sum of its proper divisors (1).

97720769 is an equidigital number, since it uses as much as digits as its factorization.

97720769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 333396, while the sum is 47.

The square root of 97720769 is about 9885.3815809002. The cubic root of 97720769 is about 460.6053294163.

It can be divided in two parts, 97720 and 769, that added together give a palindrome (98489).

The spelling of 97720769 in words is "ninety-seven million, seven hundred twenty thousand, seven hundred sixty-nine".