194951899 has 4 divisors (see below), whose sum is σ = 195645960. Its totient is φ = 194257840.

The previous prime is 194951893. The next prime is 194951909. The reversal of 194951899 is 998159491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 998159491 = 7 ⋅142594213.

It is a cyclic number.

It is not a de Polignac number, because 194951899 - 2¹⁷ = 194820827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194951893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 346609 + ... + 347170.

It is an arithmetic number, because the mean of its divisors is an integer number (48911490).

Almost surely, 2^194951899 is an apocalyptic number.

194951899 is a deficient number, since it is larger than the sum of its proper divisors (694061).

194951899 is an equidigital number, since it uses as much as digits as its factorization.

194951899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694060.

The product of its digits is 1049760, while the sum is 55.

The square root of 194951899 is about 13962.5176454678. The cubic root of 194951899 is about 579.8413150904.

The spelling of 194951899 in words is "one hundred ninety-four million, nine hundred fifty-one thousand, eight hundred ninety-nine".