194428081 has 8 divisors (see below), whose sum is σ = 202091904. Its totient is φ = 186891120.

The previous prime is 194428079. The next prime is 194428097. The reversal of 194428081 is 180824491.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 194428081 - 2¹ = 194428079 is a prime.

It is a super-2 number, since 2×194428081² = 75604557362685122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 194428081.

It is not an unprimeable number, because it can be changed into a prime (194428021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28585 + ... + 34726.

It is an arithmetic number, because the mean of its divisors is an integer number (25261488).

Almost surely, 2^194428081 is an apocalyptic number.

It is an amenable number.

194428081 is a deficient number, since it is larger than the sum of its proper divisors (7663823).

194428081 is an equidigital number, since it uses as much as digits as its factorization.

194428081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63431.

The product of its (nonzero) digits is 18432, while the sum is 37.

The square root of 194428081 is about 13943.7470215147. The cubic root of 194428081 is about 579.3215223293.

It can be divided in two parts, 194 and 428081, that added together give a triangular number (428275 = T₉₂₅).

The spelling of 194428081 in words is "one hundred ninety-four million, four hundred twenty-eight thousand, eighty-one".