90009769 has 2 divisors, whose sum is σ = 90009770. Its totient is φ = 90009768.

The previous prime is 90009763. The next prime is 90009779. The reversal of 90009769 is 96790009.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74304400 + 15705369 = 8620^2 + 3963^2 .

It is a cyclic number.

It is not a de Polignac number, because 90009769 - 2¹¹ = 90007721 is a prime.

It is a super-2 number, since 2×90009769² = 16203517030866722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (90009763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45004884 + 45004885.

It is an arithmetic number, because the mean of its divisors is an integer number (45004885).

Almost surely, 2^90009769 is an apocalyptic number.

It is an amenable number.

90009769 is a deficient number, since it is larger than the sum of its proper divisors (1).

90009769 is an equidigital number, since it uses as much as digits as its factorization.

90009769 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30618, while the sum is 40.

The square root of 90009769 is about 9487.3478380420. The cubic root of 90009769 is about 448.1566884554.

It can be divided in two parts, 9000 and 9769, that added together give a square (18769 = 137²).

The spelling of 90009769 in words is "ninety million, nine thousand, seven hundred sixty-nine".