155403233 has 2 divisors, whose sum is σ = 155403234. Its totient is φ = 155403232.

The previous prime is 155403229. The next prime is 155403263. The reversal of 155403233 is 332304551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132526144 + 22877089 = 11512^2 + 4783^2 .

It is a cyclic number.

It is not a de Polignac number, because 155403233 - 2² = 155403229 is a prime.

It is not a weakly prime, because it can be changed into another prime (155403263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77701616 + 77701617.

It is an arithmetic number, because the mean of its divisors is an integer number (77701617).

Almost surely, 2^155403233 is an apocalyptic number.

It is an amenable number.

155403233 is a deficient number, since it is larger than the sum of its proper divisors (1).

155403233 is an equidigital number, since it uses as much as digits as its factorization.

155403233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 26.

The square root of 155403233 is about 12466.0833063156. The cubic root of 155403233 is about 537.6339473633.

Adding to 155403233 its reverse (332304551), we get a palindrome (487707784).

The spelling of 155403233 in words is "one hundred fifty-five million, four hundred three thousand, two hundred thirty-three".