155500243 has 2 divisors, whose sum is σ = 155500244. Its totient is φ = 155500242.

The previous prime is 155500231. The next prime is 155500271. The reversal of 155500243 is 342005551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155500243 - 2²¹ = 153403091 is a prime.

It is not a weakly prime, because it can be changed into another prime (155500043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77750121 + 77750122.

It is an arithmetic number, because the mean of its divisors is an integer number (77750122).

Almost surely, 2^155500243 is an apocalyptic number.

155500243 is a deficient number, since it is larger than the sum of its proper divisors (1).

155500243 is an equidigital number, since it uses as much as digits as its factorization.

155500243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 155500243 is about 12469.9736567484. The cubic root of 155500243 is about 537.7457962167.

Adding to 155500243 its reverse (342005551), we get a palindrome (497505794).

The spelling of 155500243 in words is "one hundred fifty-five million, five hundred thousand, two hundred forty-three".