155204047 has 2 divisors, whose sum is σ = 155204048. Its totient is φ = 155204046.

The previous prime is 155204039. The next prime is 155204051. The reversal of 155204047 is 740402551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 155204047 - 2³ = 155204039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155204017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77602023 + 77602024.

It is an arithmetic number, because the mean of its divisors is an integer number (77602024).

Almost surely, 2^155204047 is an apocalyptic number.

155204047 is a deficient number, since it is larger than the sum of its proper divisors (1).

155204047 is an equidigital number, since it uses as much as digits as its factorization.

155204047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5600, while the sum is 28.

The square root of 155204047 is about 12458.0916275327. The cubic root of 155204047 is about 537.4041474650.

Adding to 155204047 its reverse (740402551), we get a palindrome (895606598).

The spelling of 155204047 in words is "one hundred fifty-five million, two hundred four thousand, forty-seven".