155215133 has 2 divisors, whose sum is σ = 155215134. Its totient is φ = 155215132.

The previous prime is 155215121. The next prime is 155215139. The reversal of 155215133 is 331512551.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154828249 + 386884 = 12443^2 + 622^2 .

It is a cyclic number.

It is not a de Polignac number, because 155215133 - 2⁶ = 155215069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155215139) 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, 77607566 + 77607567.

It is an arithmetic number, because the mean of its divisors is an integer number (77607567).

Almost surely, 2^155215133 is an apocalyptic number.

It is an amenable number.

155215133 is a deficient number, since it is larger than the sum of its proper divisors (1).

155215133 is an equidigital number, since it uses as much as digits as its factorization.

155215133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2250, while the sum is 26.

The square root of 155215133 is about 12458.5365512969. The cubic root of 155215133 is about 537.4169424934.

Adding to 155215133 its reverse (331512551), we get a palindrome (486727684).

The spelling of 155215133 in words is "one hundred fifty-five million, two hundred fifteen thousand, one hundred thirty-three".