155238649 has 2 divisors, whose sum is σ = 155238650. Its totient is φ = 155238648.

The previous prime is 155238623. The next prime is 155238689. The reversal of 155238649 is 946832551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90725625 + 64513024 = 9525^2 + 8032^2 .

It is a cyclic number.

It is not a de Polignac number, because 155238649 - 2⁷ = 155238521 is a prime.

It is not a weakly prime, because it can be changed into another prime (155238689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77619324 + 77619325.

It is an arithmetic number, because the mean of its divisors is an integer number (77619325).

Almost surely, 2^155238649 is an apocalyptic number.

It is an amenable number.

155238649 is a deficient number, since it is larger than the sum of its proper divisors (1).

155238649 is an equidigital number, since it uses as much as digits as its factorization.

155238649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 259200, while the sum is 43.

The square root of 155238649 is about 12459.4802861115. The cubic root of 155238649 is about 537.4440817256. Note that the first 3 decimals are identical.

The spelling of 155238649 in words is "one hundred fifty-five million, two hundred thirty-eight thousand, six hundred forty-nine".