289995557 has 2 divisors, whose sum is σ = 289995558. Its totient is φ = 289995556.

The previous prime is 289995547. The next prime is 289995599. The reversal of 289995557 is 755599982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145178401 + 144817156 = 12049^2 + 12034^2 .

It is a cyclic number.

It is not a de Polignac number, because 289995557 - 2²² = 285801253 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 289995496 and 289995505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (289995527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144997778 + 144997779.

It is an arithmetic number, because the mean of its divisors is an integer number (144997779).

Almost surely, 2^289995557 is an apocalyptic number.

It is an amenable number.

289995557 is a deficient number, since it is larger than the sum of its proper divisors (1).

289995557 is an equidigital number, since it uses as much as digits as its factorization.

289995557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10206000, while the sum is 59.

The square root of 289995557 is about 17029.2559144550. The cubic root of 289995557 is about 661.9072144764.

The spelling of 289995557 in words is "two hundred eighty-nine million, nine hundred ninety-five thousand, five hundred fifty-seven".