124142809 has 4 divisors (see below), whose sum is σ = 141877504. Its totient is φ = 106408116.

The previous prime is 124142779. The next prime is 124142819. The reversal of 124142809 is 908241421.

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 124142809 - 2¹³ = 124134617 is a prime.

It is a super-2 number, since 2×124142809² = 30822874052820962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (124142819) 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, 8867337 + ... + 8867350.

It is an arithmetic number, because the mean of its divisors is an integer number (35469376).

Almost surely, 2^124142809 is an apocalyptic number.

It is an amenable number.

124142809 is a deficient number, since it is larger than the sum of its proper divisors (17734695).

124142809 is an equidigital number, since it uses as much as digits as its factorization.

124142809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17734694.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 124142809 is about 11141.9391938746. The cubic root of 124142809 is about 498.8544561295.

The spelling of 124142809 in words is "one hundred twenty-four million, one hundred forty-two thousand, eight hundred nine".