123910509 has 4 divisors (see below), whose sum is σ = 165214016. Its totient is φ = 82607004.

The previous prime is 123910469. The next prime is 123910541. The reversal of 123910509 is 905019321.

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 not a de Polignac number, because 123910509 - 2⁸ = 123910253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123910559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20651749 + ... + 20651754.

It is an arithmetic number, because the mean of its divisors is an integer number (41303504).

Almost surely, 2^123910509 is an apocalyptic number.

It is an amenable number.

123910509 is a deficient number, since it is larger than the sum of its proper divisors (41303507).

123910509 is an equidigital number, since it uses as much as digits as its factorization.

123910509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41303506.

The product of its (nonzero) digits is 2430, while the sum is 30.

The square root of 123910509 is about 11131.5097358804. The cubic root of 123910509 is about 498.5431043667.

The spelling of 123910509 in words is "one hundred twenty-three million, nine hundred ten thousand, five hundred nine".