155555149 has 2 divisors, whose sum is σ = 155555150. Its totient is φ = 155555148.

The previous prime is 155555119. The next prime is 155555177. The reversal of 155555149 is 941555551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 151733124 + 3822025 = 12318^2 + 1955^2 .

It is an emirp because it is prime and its reverse (941555551) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155555149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155555119) 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, 77777574 + 77777575.

It is an arithmetic number, because the mean of its divisors is an integer number (77777575).

Almost surely, 2^155555149 is an apocalyptic number.

It is an amenable number.

155555149 is a deficient number, since it is larger than the sum of its proper divisors (1).

155555149 is an equidigital number, since it uses as much as digits as its factorization.

155555149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 112500, while the sum is 40.

The square root of 155555149 is about 12472.1749907544. The cubic root of 155555149 is about 537.8090801399.

The spelling of 155555149 in words is "one hundred fifty-five million, five hundred fifty-five thousand, one hundred forty-nine".