155403229 has 2 divisors, whose sum is σ = 155403230. Its totient is φ = 155403228.

The previous prime is 155403221. The next prime is 155403233. The reversal of 155403229 is 922304551.

155403229 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 145805625 + 9597604 = 12075^2 + 3098^2 .

It is a cyclic number.

It is not a de Polignac number, because 155403229 - 2³ = 155403221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 155403229.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155403221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77701614 + 77701615.

It is an arithmetic number, because the mean of its divisors is an integer number (77701615).

Almost surely, 2^155403229 is an apocalyptic number.

It is an amenable number.

155403229 is a deficient number, since it is larger than the sum of its proper divisors (1).

155403229 is an equidigital number, since it uses as much as digits as its factorization.

155403229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 155403229 is about 12466.0831458803. The cubic root of 155403229 is about 537.6339427505.

It can be divided in two parts, 15540 and 3229, that added together give a square (18769 = 137²).

The spelling of 155403229 in words is "one hundred fifty-five million, four hundred three thousand, two hundred twenty-nine".