194312574481 has 3 divisors (see below), whose sum is σ = 194313015291. Its totient is φ = 194312133672.

The previous prime is 194312574461. The next prime is 194312574509. The reversal of 194312574481 is 184475213491.

The square root of 194312574481 is 440809.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 169751416081 + 24561158400 = 412009^2 + 156720^2 .

It is not a de Polignac number, because 194312574481 - 2⁷ = 194312574353 is a prime.

It is a super-2 number, since 2×194312574481² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194312574431) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 220405 + ... + 661213.

It is an arithmetic number, because the mean of its divisors is an integer number (64771005097).

Almost surely, 2^194312574481 is an apocalyptic number.

194312574481 is the 440809-th square number.

194312574481 is the 220405-th centered octagonal number.

It is an amenable number.

194312574481 is a deficient number, since it is larger than the sum of its proper divisors (440810).

194312574481 is an frugal number, since it uses more digits than its factorization.

194312574481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881618 (or 440809 counting only the distinct ones).

The product of its digits is 967680, while the sum is 49.

Multiplying 194312574481 by its sum of digits (49), we get a square (9521316149569 = 3085663²).

The spelling of 194312574481 in words is "one hundred ninety-four billion, three hundred twelve million, five hundred seventy-four thousand, four hundred eighty-one".