123507289 has 2 divisors, whose sum is σ = 123507290. Its totient is φ = 123507288.

The previous prime is 123507283. The next prime is 123507299. The reversal of 123507289 is 982705321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119180889 + 4326400 = 10917^2 + 2080^2 .

It is a cyclic number.

It is not a de Polignac number, because 123507289 - 2²³ = 115118681 is a prime.

It is a super-2 number, since 2×123507289² = 30508100872259042, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (123507283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61753644 + 61753645.

It is an arithmetic number, because the mean of its divisors is an integer number (61753645).

Almost surely, 2^123507289 is an apocalyptic number.

It is an amenable number.

123507289 is a deficient number, since it is larger than the sum of its proper divisors (1).

123507289 is an equidigital number, since it uses as much as digits as its factorization.

123507289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 123507289 is about 11113.3833282219. The cubic root of 123507289 is about 498.0017432454.

The spelling of 123507289 in words is "one hundred twenty-three million, five hundred seven thousand, two hundred eighty-nine".