155311243 has 2 divisors, whose sum is σ = 155311244. Its totient is φ = 155311242.

The previous prime is 155311241. The next prime is 155311309. The reversal of 155311243 is 342113551.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155311243 - 2¹ = 155311241 is a prime.

Together with 155311241, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (155311241) 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, 77655621 + 77655622.

It is an arithmetic number, because the mean of its divisors is an integer number (77655622).

Almost surely, 2^155311243 is an apocalyptic number.

155311243 is a deficient number, since it is larger than the sum of its proper divisors (1).

155311243 is an equidigital number, since it uses as much as digits as its factorization.

155311243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 25.

The square root of 155311243 is about 12462.3931489903. The cubic root of 155311243 is about 537.5278433747.

Adding to 155311243 its reverse (342113551), we get a palindrome (497424794).

The spelling of 155311243 in words is "one hundred fifty-five million, three hundred eleven thousand, two hundred forty-three".