97920769 has 2 divisors, whose sum is σ = 97920770. Its totient is φ = 97920768.

The previous prime is 97920749. The next prime is 97920793. The reversal of 97920769 is 96702979.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97772544 + 148225 = 9888^2 + 385^2 .

It is an emirp because it is prime and its reverse (96702979) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97920769 - 2⁹ = 97920257 is a prime.

It is a super-2 number, since 2×97920769² = 19176954003102722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (97920709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48960384 + 48960385.

It is an arithmetic number, because the mean of its divisors is an integer number (48960385).

Almost surely, 2^97920769 is an apocalyptic number.

It is an amenable number.

97920769 is a deficient number, since it is larger than the sum of its proper divisors (1).

97920769 is an equidigital number, since it uses as much as digits as its factorization.

97920769 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 428652, while the sum is 49.

The square root of 97920769 is about 9895.4923576344. The cubic root of 97920769 is about 460.9193475851.

It can be divided in two parts, 97920 and 769, that added together give a palindrome (98689).

The spelling of 97920769 in words is "ninety-seven million, nine hundred twenty thousand, seven hundred sixty-nine".