1241638109 has 8 divisors (see below), whose sum is σ = 1246073400. Its totient is φ = 1237211136.

The previous prime is 1241638033. The next prime is 1241638159. The reversal of 1241638109 is 9018361421.

It can be written as a sum of positive squares in 4 ways, for example, as 209815225 + 1031822884 = 14485^2 + 32122^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1241638109 - 2⁸ = 1241637853 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 (1241638159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 462479 + ... + 465155.

It is an arithmetic number, because the mean of its divisors is an integer number (155759175).

Almost surely, 2^1241638109 is an apocalyptic number.

It is an amenable number.

1241638109 is a deficient number, since it is larger than the sum of its proper divisors (4435291).

1241638109 is a wasteful number, since it uses less digits than its factorization.

1241638109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4159.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 1241638109 is about 35236.8856313948. The cubic root of 1241638109 is about 1074.8099491681.

The spelling of 1241638109 in words is "one billion, two hundred forty-one million, six hundred thirty-eight thousand, one hundred nine".