90723869 has 2 divisors, whose sum is σ = 90723870. Its totient is φ = 90723868.

The previous prime is 90723859. The next prime is 90723911. The reversal of 90723869 is 96832709.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87703225 + 3020644 = 9365^2 + 1738^2 .

It is an emirp because it is prime and its reverse (96832709) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90723869 - 2¹² = 90719773 is a prime.

It is a super-2 number, since 2×90723869² = 16461640812658322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90723859) 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, 45361934 + 45361935.

It is an arithmetic number, because the mean of its divisors is an integer number (45361935).

Almost surely, 2^90723869 is an apocalyptic number.

It is an amenable number.

90723869 is a deficient number, since it is larger than the sum of its proper divisors (1).

90723869 is an equidigital number, since it uses as much as digits as its factorization.

90723869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 90723869 is about 9524.9078210763. The cubic root of 90723869 is about 449.3387308070.

The spelling of 90723869 in words is "ninety million, seven hundred twenty-three thousand, eight hundred sixty-nine".