155312233 has 2 divisors, whose sum is σ = 155312234. Its totient is φ = 155312232.

The previous prime is 155312219. The next prime is 155312279. The reversal of 155312233 is 332213551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140849424 + 14462809 = 11868^2 + 3803^2 .

It is an emirp because it is prime and its reverse (332213551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155312233 - 2⁹ = 155311721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 155312198 and 155312207.

It is not a weakly prime, because it can be changed into another prime (155312203) 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, 77656116 + 77656117.

It is an arithmetic number, because the mean of its divisors is an integer number (77656117).

Almost surely, 2^155312233 is an apocalyptic number.

It is an amenable number.

155312233 is a deficient number, since it is larger than the sum of its proper divisors (1).

155312233 is an equidigital number, since it uses as much as digits as its factorization.

155312233 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2700, while the sum is 25.

The square root of 155312233 is about 12462.4328684250. The cubic root of 155312233 is about 537.5289854930.

Adding to 155312233 its reverse (332213551), we get a palindrome (487525784).

The spelling of 155312233 in words is "one hundred fifty-five million, three hundred twelve thousand, two hundred thirty-three".