155649149 has 2 divisors, whose sum is σ = 155649150. Its totient is φ = 155649148.

The previous prime is 155649113. The next prime is 155649157. The reversal of 155649149 is 941946551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124768900 + 30880249 = 11170^2 + 5557^2 .

It is a cyclic number.

It is not a de Polignac number, because 155649149 - 2²⁰ = 154600573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155649649) 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, 77824574 + 77824575.

It is an arithmetic number, because the mean of its divisors is an integer number (77824575).

Almost surely, 2^155649149 is an apocalyptic number.

It is an amenable number.

155649149 is a deficient number, since it is larger than the sum of its proper divisors (1).

155649149 is an equidigital number, since it uses as much as digits as its factorization.

155649149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 194400, while the sum is 44.

The square root of 155649149 is about 12475.9428100645. The cubic root of 155649149 is about 537.9173887242.

It can be divided in two parts, 1556 and 49149, that added together give a palindrome (50705).

The spelling of 155649149 in words is "one hundred fifty-five million, six hundred forty-nine thousand, one hundred forty-nine".