194991029 has 2 divisors, whose sum is σ = 194991030. Its totient is φ = 194991028.

The previous prime is 194991019. The next prime is 194991031. The reversal of 194991029 is 920199491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153710404 + 41280625 = 12398^2 + 6425^2 .

It is an emirp because it is prime and its reverse (920199491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 194991029 - 2²⁴ = 178213813 is a prime.

Together with 194991031, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194991019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97495514 + 97495515.

It is an arithmetic number, because the mean of its divisors is an integer number (97495515).

Almost surely, 2^194991029 is an apocalyptic number.

It is an amenable number.

194991029 is a deficient number, since it is larger than the sum of its proper divisors (1).

194991029 is an equidigital number, since it uses as much as digits as its factorization.

194991029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 44.

The square root of 194991029 is about 13963.9188267477. The cubic root of 194991029 is about 579.8801070059.

The spelling of 194991029 in words is "one hundred ninety-four million, nine hundred ninety-one thousand, twenty-nine".