18287229191449 has 9 divisors (see below), whose sum is σ = 18896306167701. Its totient is φ = 17697190281660.

The previous prime is 18287229191447. The next prime is 18287229191453. The reversal of 18287229191449 is 94419192278281.

The square root of 18287229191449 is 4276357.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 18287229191449 - 2¹ = 18287229191447 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18287229191447) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 132498094 + ... + 132636040.

It is an arithmetic number, because the mean of its divisors is an integer number (2099589574189).

Almost surely, 2^{18287229191449} is an apocalyptic number.

18287229191449 is the 4276357-th square number.

18287229191449 is the 2138179-th centered octagonal number.

It is an amenable number.

18287229191449 is a deficient number, since it is larger than the sum of its proper divisors (609076976252).

18287229191449 is an frugal number, since it uses more digits than its factorization.

18287229191449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275956 (or 137978 counting only the distinct ones).

The product of its digits is 41803776, while the sum is 67.

The spelling of 18287229191449 in words is "eighteen trillion, two hundred eighty-seven billion, two hundred twenty-nine million, one hundred ninety-one thousand, four hundred forty-nine".