155161549 has 2 divisors, whose sum is σ = 155161550. Its totient is φ = 155161548.

The previous prime is 155161459. The next prime is 155161577. The reversal of 155161549 is 945161551.

Together with previous prime (155161459) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 150675625 + 4485924 = 12275^2 + 2118^2 .

It is a cyclic number.

It is not a de Polignac number, because 155161549 - 2⁷ = 155161421 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 (155161579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77580774 + 77580775.

It is an arithmetic number, because the mean of its divisors is an integer number (77580775).

Almost surely, 2^155161549 is an apocalyptic number.

It is an amenable number.

155161549 is a deficient number, since it is larger than the sum of its proper divisors (1).

155161549 is an equidigital number, since it uses as much as digits as its factorization.

155161549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27000, while the sum is 37.

The square root of 155161549 is about 12456.3858723146. The cubic root of 155161549 is about 537.3550922873.

The spelling of 155161549 in words is "one hundred fifty-five million, one hundred sixty-one thousand, five hundred forty-nine".