159185749 has 2 divisors, whose sum is σ = 159185750. Its totient is φ = 159185748.

The previous prime is 159185731. The next prime is 159185753. The reversal of 159185749 is 947581951.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159138225 + 47524 = 12615^2 + 218^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-159185749 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (159185759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79592874 + 79592875.

It is an arithmetic number, because the mean of its divisors is an integer number (79592875).

Almost surely, 2^159185749 is an apocalyptic number.

It is an amenable number.

159185749 is a deficient number, since it is larger than the sum of its proper divisors (1).

159185749 is an equidigital number, since it uses as much as digits as its factorization.

159185749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 453600, while the sum is 49.

The square root of 159185749 is about 12616.8834899907. The cubic root of 159185749 is about 541.9610328144.

The spelling of 159185749 in words is "one hundred fifty-nine million, one hundred eighty-five thousand, seven hundred forty-nine".