90999865783289 has 2 divisors, whose sum is σ = 90999865783290. Its totient is φ = 90999865783288.

The previous prime is 90999865783271. The next prime is 90999865783303. The reversal of 90999865783289 is 98238756899909.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90919276225600 + 80589557689 = 9535160^2 + 283883^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90999865783289 is a prime.

It is a super-2 number, since 2×90999865783289² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 90999865783198 and 90999865783207.

It is not a weakly prime, because it can be changed into another prime (90999865785289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45499932891644 + 45499932891645.

It is an arithmetic number, because the mean of its divisors is an integer number (45499932891645).

Almost surely, 2^{90999865783289} is an apocalyptic number.

It is an amenable number.

90999865783289 is a deficient number, since it is larger than the sum of its proper divisors (1).

90999865783289 is an equidigital number, since it uses as much as digits as its factorization.

90999865783289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38093690880, while the sum is 92.

The spelling of 90999865783289 in words is "ninety trillion, nine hundred ninety-nine billion, eight hundred sixty-five million, seven hundred eighty-three thousand, two hundred eighty-nine".