155077229 has 2 divisors, whose sum is σ = 155077230. Its totient is φ = 155077228.

The previous prime is 155077207. The next prime is 155077231. The reversal of 155077229 is 922770551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 150675625 + 4401604 = 12275^2 + 2098^2 .

It is a cyclic number.

It is not a de Polignac number, because 155077229 - 2²⁴ = 138300013 is a prime.

It is a Sophie Germain prime.

Together with 155077231, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 155077192 and 155077201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155077289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77538614 + 77538615.

It is an arithmetic number, because the mean of its divisors is an integer number (77538615).

Almost surely, 2^155077229 is an apocalyptic number.

It is an amenable number.

155077229 is a deficient number, since it is larger than the sum of its proper divisors (1).

155077229 is an equidigital number, since it uses as much as digits as its factorization.

155077229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 44100, while the sum is 38.

The square root of 155077229 is about 12453.0008030193. Note that the first 3 decimals coincide. The cubic root of 155077229 is about 537.2577357111.

The spelling of 155077229 in words is "one hundred fifty-five million, seventy-seven thousand, two hundred twenty-nine".