123741509 has 4 divisors (see below), whose sum is σ = 130254240. Its totient is φ = 117228780.

The previous prime is 123741503. The next prime is 123741511. The reversal of 123741509 is 905147321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 123741509 - 2⁸ = 123741253 is a prime.

It is a super-2 number, since 2×123741509² = 30623922099194162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123741503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3256337 + ... + 3256374.

It is an arithmetic number, because the mean of its divisors is an integer number (32563560).

Almost surely, 2^123741509 is an apocalyptic number.

123741509 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

123741509 is a deficient number, since it is larger than the sum of its proper divisors (6512731).

123741509 is an equidigital number, since it uses as much as digits as its factorization.

123741509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6512730.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 123741509 is about 11123.9160820279. The cubic root of 123741509 is about 498.3163490021.

The spelling of 123741509 in words is "one hundred twenty-three million, seven hundred forty-one thousand, five hundred nine".