155122549 has 2 divisors, whose sum is σ = 155122550. Its totient is φ = 155122548.

The previous prime is 155122547. The next prime is 155122571. The reversal of 155122549 is 945221551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130302225 + 24820324 = 11415^2 + 4982^2 .

It is an emirp because it is prime and its reverse (945221551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155122549 - 2¹ = 155122547 is a prime.

Together with 155122547, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155122547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77561274 + 77561275.

It is an arithmetic number, because the mean of its divisors is an integer number (77561275).

Almost surely, 2^155122549 is an apocalyptic number.

It is an amenable number.

155122549 is a deficient number, since it is larger than the sum of its proper divisors (1).

155122549 is an equidigital number, since it uses as much as digits as its factorization.

155122549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18000, while the sum is 34.

The square root of 155122549 is about 12454.8203118311. The cubic root of 155122549 is about 537.3100669469.

The spelling of 155122549 in words is "one hundred fifty-five million, one hundred twenty-two thousand, five hundred forty-nine".