99997769 has 2 divisors, whose sum is σ = 99997770. Its totient is φ = 99997768.

The previous prime is 99997759. The next prime is 99997783. The reversal of 99997769 is 96779999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57942544 + 42055225 = 7612^2 + 6485^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99997769 is a prime.

It is a super-2 number, since 2×99997769² = 19999107609954722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (99997759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49998884 + 49998885.

It is an arithmetic number, because the mean of its divisors is an integer number (49998885).

Almost surely, 2^99997769 is an apocalyptic number.

It is an amenable number.

99997769 is a deficient number, since it is larger than the sum of its proper divisors (1).

99997769 is an equidigital number, since it uses as much as digits as its factorization.

99997769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17360406, while the sum is 65.

The square root of 99997769 is about 9999.8884493778. Note that the first 3 decimals coincide. The cubic root of 99997769 is about 464.1554315407.

The spelling of 99997769 in words is "ninety-nine million, nine hundred ninety-seven thousand, seven hundred sixty-nine".