195087749 has 2 divisors, whose sum is σ = 195087750. Its totient is φ = 195087748.

The previous prime is 195087713. The next prime is 195087797. The reversal of 195087749 is 947780591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 191822500 + 3265249 = 13850^2 + 1807^2 .

It is a cyclic number.

It is not a de Polignac number, because 195087749 - 2⁸ = 195087493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 195087697 and 195087706.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195084749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97543874 + 97543875.

It is an arithmetic number, because the mean of its divisors is an integer number (97543875).

Almost surely, 2^195087749 is an apocalyptic number.

It is an amenable number.

195087749 is a deficient number, since it is larger than the sum of its proper divisors (1).

195087749 is an equidigital number, since it uses as much as digits as its factorization.

195087749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 635040, while the sum is 50.

The square root of 195087749 is about 13967.3816085908. The cubic root of 195087749 is about 579.9759690797.

The spelling of 195087749 in words is "one hundred ninety-five million, eighty-seven thousand, seven hundred forty-nine".