194197351991841 has 27 divisors (see below), whose sum is σ = 308326920763953. Its totient is φ = 117695086134120.

The previous prime is 194197351991833. The next prime is 194197351991921. The reversal of 194197351991841 is 148199153791491.

The square root of 194197351991841 is 13935471.

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

194197351991841 is a `hidden beast` number, since 1 + 9 + 4 + 1 + 9 + 7 + 351 + 99 + 184 + 1 = 666.

It is not a de Polignac number, because 194197351991841 - 2³ = 194197351991833 is a prime.

It is a super-2 number, since 2×194197351991841² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 194197351991841.

It is not an unprimeable number, because it can be changed into a prime (194197351991831) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 459659400 + ... + 460081686.

Almost surely, 2^{194197351991841} is an apocalyptic number.

194197351991841 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

194197351991841 is the 13935471-st square number.

194197351991841 is the 6967736-th centered octagonal number.

It is an amenable number.

194197351991841 is a deficient number, since it is larger than the sum of its proper divisors (114129568772112).

194197351991841 is an frugal number, since it uses more digits than its factorization.

194197351991841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 844602 (or 422301 counting only the distinct ones).

The product of its digits is 88179840, while the sum is 72.

The spelling of 194197351991841 in words is "one hundred ninety-four trillion, one hundred ninety-seven billion, three hundred fifty-one million, nine hundred ninety-one thousand, eight hundred forty-one".