194881069 has 2 divisors, whose sum is σ = 194881070. Its totient is φ = 194881068.

The previous prime is 194881021. The next prime is 194881079. The reversal of 194881069 is 960188491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192515625 + 2365444 = 13875^2 + 1538^2 .

It is a cyclic number.

It is not a de Polignac number, because 194881069 - 2⁹ = 194880557 is a prime.

It is a super-2 number, since 2×194881069² = 75957262109165522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194881009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97440534 + 97440535.

It is an arithmetic number, because the mean of its divisors is an integer number (97440535).

Almost surely, 2^194881069 is an apocalyptic number.

It is an amenable number.

194881069 is a deficient number, since it is larger than the sum of its proper divisors (1).

194881069 is an equidigital number, since it uses as much as digits as its factorization.

194881069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 46.

The square root of 194881069 is about 13959.9809813624. The cubic root of 194881069 is about 579.7710838600.

The spelling of 194881069 in words is "one hundred ninety-four million, eight hundred eighty-one thousand, sixty-nine".