18315241491 has 8 divisors (see below), whose sum is σ = 24473067520. Its totient is φ = 12183788232.

The previous prime is 18315241489. The next prime is 18315241517. The reversal of 18315241491 is 19414251381.

It is a happy number.

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

It is not a de Polignac number, because 18315241491 - 2¹ = 18315241489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18315241291) 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, 6591571 + ... + 6594348.

It is an arithmetic number, because the mean of its divisors is an integer number (3059133440).

Almost surely, 2^18315241491 is an apocalyptic number.

18315241491 is a deficient number, since it is larger than the sum of its proper divisors (6157826029).

18315241491 is a wasteful number, since it uses less digits than its factorization.

18315241491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13186385.

The product of its digits is 34560, while the sum is 39.

The spelling of 18315241491 in words is "eighteen billion, three hundred fifteen million, two hundred forty-one thousand, four hundred ninety-one".