194447434802481 has 81 divisors (see below), whose sum is σ = 327666609514881. Its totient is φ = 110793380632704.

The previous prime is 194447434802323. The next prime is 194447434802539. The reversal of 194447434802481 is 184208434744491.

The square root of 194447434802481 is 13944441.

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

194447434802481 is a `hidden beast` number, since 1 + 9 + 4 + 4 + 4 + 74 + 3 + 4 + 80 + 2 + 481 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 144071792946081 + 50375641856400 = 12002991^2 + 7097580^2 .

It is not a de Polignac number, because 194447434802481 - 2⁹ = 194447434801969 is a prime.

It is a super-2 number, since 2×194447434802481² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (194447434802281) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 133824799551 + ... + 133824801003.

Almost surely, 2^{194447434802481} is an apocalyptic number.

194447434802481 is the 13944441-st square number.

194447434802481 is the 6972221-st centered octagonal number.

It is an amenable number.

194447434802481 is a deficient number, since it is larger than the sum of its proper divisors (133219174712400).

194447434802481 is an frugal number, since it uses more digits than its factorization.

194447434802481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3840 (or 1920 counting only the distinct ones).

The product of its (nonzero) digits is 99090432, while the sum is 63.

The spelling of 194447434802481 in words is "one hundred ninety-four trillion, four hundred forty-seven billion, four hundred thirty-four million, eight hundred two thousand, four hundred eighty-one".