155533229 has 2 divisors, whose sum is σ = 155533230. Its totient is φ = 155533228.

The previous prime is 155533211. The next prime is 155533241. The reversal of 155533229 is 922335551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141657604 + 13875625 = 11902^2 + 3725^2 .

It is an emirp because it is prime and its reverse (922335551) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155533229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155533129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77766614 + 77766615.

It is an arithmetic number, because the mean of its divisors is an integer number (77766615).

Almost surely, 2^155533229 is an apocalyptic number.

It is an amenable number.

155533229 is a deficient number, since it is larger than the sum of its proper divisors (1).

155533229 is an equidigital number, since it uses as much as digits as its factorization.

155533229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40500, while the sum is 35.

The square root of 155533229 is about 12471.2962036831. The cubic root of 155533229 is about 537.7838172264.

The spelling of 155533229 in words is "one hundred fifty-five million, five hundred thirty-three thousand, two hundred twenty-nine".