194581969 has 2 divisors, whose sum is σ = 194581970. Its totient is φ = 194581968.

The previous prime is 194581943. The next prime is 194581993. The reversal of 194581969 is 969185491.

It is a happy number.

194581969 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98247744 + 96334225 = 9912^2 + 9815^2 .

It is a cyclic number.

It is not a de Polignac number, because 194581969 - 2¹¹ = 194579921 is a prime.

It is a super-2 number, since 2×194581969² = 75724285319833922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (194581939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97290984 + 97290985.

It is an arithmetic number, because the mean of its divisors is an integer number (97290985).

Almost surely, 2^194581969 is an apocalyptic number.

It is an amenable number.

194581969 is a deficient number, since it is larger than the sum of its proper divisors (1).

194581969 is an equidigital number, since it uses as much as digits as its factorization.

194581969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 699840, while the sum is 52.

The square root of 194581969 is about 13949.2641024536. The cubic root of 194581969 is about 579.4743245372.

The spelling of 194581969 in words is "one hundred ninety-four million, five hundred eighty-one thousand, nine hundred sixty-nine".