194321390761 has 9 divisors (see below), whose sum is σ = 205095958743. Its totient is φ = 184086014400.

The previous prime is 194321390741. The next prime is 194321390789. The reversal of 194321390761 is 167093123491.

The square root of 194321390761 is 440819.

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

It can be written as a sum of positive squares in only one way, i.e., 181151533161 + 13169857600 = 425619^2 + 114760^2 .

It is a de Polignac number, because none of the positive numbers 2^k-194321390761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194321390741) 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, 8363961 + ... + 8387161.

Almost surely, 2^194321390761 is an apocalyptic number.

194321390761 is the 440819-th square number.

194321390761 is the 220410-th centered octagonal number.

It is an amenable number.

194321390761 is a deficient number, since it is larger than the sum of its proper divisors (10774567982).

194321390761 is an frugal number, since it uses more digits than its factorization.

194321390761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46440 (or 23220 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 46.

The spelling of 194321390761 in words is "one hundred ninety-four billion, three hundred twenty-one million, three hundred ninety thousand, seven hundred sixty-one".