155019649 has 2 divisors, whose sum is σ = 155019650. Its totient is φ = 155019648.

The previous prime is 155019643. The next prime is 155019653. The reversal of 155019649 is 946910551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 148669249 + 6350400 = 12193^2 + 2520^2 .

It is a cyclic number.

It is not a de Polignac number, because 155019649 - 2⁷ = 155019521 is a prime.

It is not a weakly prime, because it can be changed into another prime (155019643) 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, 77509824 + 77509825.

It is an arithmetic number, because the mean of its divisors is an integer number (77509825).

Almost surely, 2^155019649 is an apocalyptic number.

It is an amenable number.

155019649 is a deficient number, since it is larger than the sum of its proper divisors (1).

155019649 is an equidigital number, since it uses as much as digits as its factorization.

155019649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48600, while the sum is 40.

The square root of 155019649 is about 12450.6886958112. The cubic root of 155019649 is about 537.1912330828.

The spelling of 155019649 in words is "one hundred fifty-five million, nineteen thousand, six hundred forty-nine".