123410509 has 2 divisors, whose sum is σ = 123410510. Its totient is φ = 123410508.

The previous prime is 123410501. The next prime is 123410537. The reversal of 123410509 is 905014321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83997225 + 39413284 = 9165^2 + 6278^2 .

It is a cyclic number.

It is not a de Polignac number, because 123410509 - 2³ = 123410501 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123410501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61705254 + 61705255.

It is an arithmetic number, because the mean of its divisors is an integer number (61705255).

Almost surely, 2^123410509 is an apocalyptic number.

It is an amenable number.

123410509 is a deficient number, since it is larger than the sum of its proper divisors (1).

123410509 is an equidigital number, since it uses as much as digits as its factorization.

123410509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 123410509 is about 11109.0282653345. The cubic root of 123410509 is about 497.8716316179.

The spelling of 123410509 in words is "one hundred twenty-three million, four hundred ten thousand, five hundred nine".