194131281 has 4 divisors (see below), whose sum is σ = 258841712. Its totient is φ = 129420852.

The previous prime is 194131271. The next prime is 194131363. The reversal of 194131281 is 182131491.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 194131281 - 2²⁶ = 127022417 is a prime.

It is a super-2 number, since 2×194131281² = 75373908525401922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194131271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32355211 + ... + 32355216.

It is an arithmetic number, because the mean of its divisors is an integer number (64710428).

Almost surely, 2^194131281 is an apocalyptic number.

It is an amenable number.

194131281 is a deficient number, since it is larger than the sum of its proper divisors (64710431).

194131281 is an equidigital number, since it uses as much as digits as its factorization.

194131281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64710430.

The product of its digits is 1728, while the sum is 30.

The square root of 194131281 is about 13933.1001934243. The cubic root of 194131281 is about 579.0265886054.

The spelling of 194131281 in words is "one hundred ninety-four million, one hundred thirty-one thousand, two hundred eighty-one".