18313631949 has 8 divisors (see below), whose sum is σ = 24437302560. Its totient is φ = 12199524656.

The previous prime is 18313631923. The next prime is 18313631953. The reversal of 18313631949 is 94913631381.

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 18313631949 - 2²⁸ = 18045196493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18313631898 and 18313631907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18313631969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2386359 + ... + 2394020.

It is an arithmetic number, because the mean of its divisors is an integer number (3054662820).

Almost surely, 2^18313631949 is an apocalyptic number.

It is an amenable number.

18313631949 is a deficient number, since it is larger than the sum of its proper divisors (6123670611).

18313631949 is a wasteful number, since it uses less digits than its factorization.

18313631949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4781659.

The product of its digits is 419904, while the sum is 48.

The spelling of 18313631949 in words is "eighteen billion, three hundred thirteen million, six hundred thirty-one thousand, nine hundred forty-nine".