194757149 has 2 divisors, whose sum is σ = 194757150. Its totient is φ = 194757148.

The previous prime is 194757137. The next prime is 194757181. The reversal of 194757149 is 941757491.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111619225 + 83137924 = 10565^2 + 9118^2 .

It is a cyclic number.

It is not a de Polignac number, because 194757149 - 2⁴ = 194757133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194757119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97378574 + 97378575.

It is an arithmetic number, because the mean of its divisors is an integer number (97378575).

Almost surely, 2^194757149 is an apocalyptic number.

It is an amenable number.

194757149 is a deficient number, since it is larger than the sum of its proper divisors (1).

194757149 is an equidigital number, since it uses as much as digits as its factorization.

194757149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 317520, while the sum is 47.

The square root of 194757149 is about 13955.5418741087. The cubic root of 194757149 is about 579.6481704909.

The spelling of 194757149 in words is "one hundred ninety-four million, seven hundred fifty-seven thousand, one hundred forty-nine".