194931963121 has 9 divisors (see below), whose sum is σ = 226761184971. Its totient is φ = 167081890752.

The previous prime is 194931963113. The next prime is 194931963131. The reversal of 194931963121 is 121369139491.

The square root of 194931963121 is 441511.

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., 747202225 + 194184760896 = 27335^2 + 440664^2 .

It is not a de Polignac number, because 194931963121 - 2³ = 194931963113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194931963131) 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, 3059041 + ... + 3122113.

It is an arithmetic number, because the mean of its divisors is an integer number (25195687219).

Almost surely, 2^194931963121 is an apocalyptic number.

194931963121 is the 441511-st square number.

194931963121 is the 220756-th centered octagonal number.

It is an amenable number.

194931963121 is a deficient number, since it is larger than the sum of its proper divisors (31829221850).

194931963121 is an frugal number, since it uses more digits than its factorization.

194931963121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126160 (or 63080 counting only the distinct ones).

The product of its digits is 314928, while the sum is 49.

Multiplying 194931963121 by its sum of digits (49), we get a square (9551666192929 = 3090577²).

194931963121 divided by its sum of digits (49) gives a square (3978203329 = 63073²).

The spelling of 194931963121 in words is "one hundred ninety-four billion, nine hundred thirty-one million, nine hundred sixty-three thousand, one hundred twenty-one".