173978249449 has 27 divisors (see below), whose sum is σ = 190418426757. Its totient is φ = 158927777568.

The previous prime is 173978249429. The next prime is 173978249453. The reversal of 173978249449 is 944942879371.

The square root of 173978249449 is 417107.

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

It can be written as a sum of positive squares in 4 ways, for example, as 3547989225 + 170430260224 = 59565^2 + 412832^2 .

It is a de Polignac number, because none of the positive numbers 2^k-173978249449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (173978249429) 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 26 ways as a sum of consecutive naturals, for example, 229825579 + ... + 229826335.

Almost surely, 2^173978249449 is an apocalyptic number.

173978249449 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

173978249449 is the 417107-th square number.

173978249449 is the 208554-th centered octagonal number.

It is an amenable number.

173978249449 is a deficient number, since it is larger than the sum of its proper divisors (16440177308).

173978249449 is an frugal number, since it uses more digits than its factorization.

173978249449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1610 (or 805 counting only the distinct ones).

The product of its digits is 109734912, while the sum is 67.

The spelling of 173978249449 in words is "one hundred seventy-three billion, nine hundred seventy-eight million, two hundred forty-nine thousand, four hundred forty-nine".