194781625 has 16 divisors (see below), whose sum is σ = 247682448. Its totient is φ = 152880000.

The previous prime is 194781617. The next prime is 194781637. The reversal of 194781625 is 526187491.

194781625 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 83521321 + 111260304 = 9139^2 + 10548^2 .

It is not a de Polignac number, because 194781625 - 2³ = 194781617 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8076 + ... + 21325.

It is an arithmetic number, because the mean of its divisors is an integer number (15480153).

Almost surely, 2^194781625 is an apocalyptic number.

It is an amenable number.

194781625 is a deficient number, since it is larger than the sum of its proper divisors (52900823).

194781625 is an equidigital number, since it uses as much as digits as its factorization.

194781625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29469 (or 29459 counting only the distinct ones).

The product of its digits is 120960, while the sum is 43.

The square root of 194781625 is about 13956.4187741698. The cubic root of 194781625 is about 579.6724517978.

The spelling of 194781625 in words is "one hundred ninety-four million, seven hundred eighty-one thousand, six hundred twenty-five".