173187472849 has 2 divisors, whose sum is σ = 173187472850. Its totient is φ = 173187472848.

The previous prime is 173187472841. The next prime is 173187472873. The reversal of 173187472849 is 948274781371.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99094632849 + 74092840000 = 314793^2 + 272200^2 .

It is a cyclic number.

It is not a de Polignac number, because 173187472849 - 2³ = 173187472841 is a prime.

It is a super-2 number, since 2×173187472849² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (173187472841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86593736424 + 86593736425.

It is an arithmetic number, because the mean of its divisors is an integer number (86593736425).

Almost surely, 2^173187472849 is an apocalyptic number.

It is an amenable number.

173187472849 is a deficient number, since it is larger than the sum of its proper divisors (1).

173187472849 is an equidigital number, since it uses as much as digits as its factorization.

173187472849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18966528, while the sum is 61.

The spelling of 173187472849 in words is "one hundred seventy-three billion, one hundred eighty-seven million, four hundred seventy-two thousand, eight hundred forty-nine".