124191998909 has 16 divisors (see below), whose sum is σ = 141463869120. Its totient is φ = 107989848960.

The previous prime is 124191998809. The next prime is 124191998947. The reversal of 124191998909 is 909899191421.

It is a cyclic number.

It is not a de Polignac number, because 124191998909 - 2⁸ = 124191998653 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 (124191998969) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1785104 + ... + 1853369.

It is an arithmetic number, because the mean of its divisors is an integer number (8841491820).

Almost surely, 2^124191998909 is an apocalyptic number.

It is an amenable number.

124191998909 is a deficient number, since it is larger than the sum of its proper divisors (17271870211).

124191998909 is a wasteful number, since it uses less digits than its factorization.

124191998909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3638620.

The product of its (nonzero) digits is 3779136, while the sum is 62.

The spelling of 124191998909 in words is "one hundred twenty-four billion, one hundred ninety-one million, nine hundred ninety-eight thousand, nine hundred nine".