11631636109 has 4 divisors (see below), whose sum is σ = 11632201020. Its totient is φ = 11631071200.

The previous prime is 11631636101. The next prime is 11631636119. The reversal of 11631636109 is 90163613611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90163613611 = 3271 ⋅27564541.

It can be written as a sum of positive squares in 2 ways, for example, as 6959230084 + 4672406025 = 83422^2 + 68355^2 .

It is a cyclic number.

It is not a de Polignac number, because 11631636109 - 2³ = 11631636101 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 (11631636101) 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, 250354 + ... + 293155.

It is an arithmetic number, because the mean of its divisors is an integer number (2908050255).

Almost surely, 2^11631636109 is an apocalyptic number.

It is an amenable number.

11631636109 is a deficient number, since it is larger than the sum of its proper divisors (564911).

11631636109 is an equidigital number, since it uses as much as digits as its factorization.

11631636109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564910.

The product of its (nonzero) digits is 17496, while the sum is 37.

The spelling of 11631636109 in words is "eleven billion, six hundred thirty-one million, six hundred thirty-six thousand, one hundred nine".