155005447 has 2 divisors, whose sum is σ = 155005448. Its totient is φ = 155005446.

The previous prime is 155005429. The next prime is 155005451. The reversal of 155005447 is 744500551.

It is a strong prime.

It is an emirp because it is prime and its reverse (744500551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155005447 - 2²³ = 146616839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155005427) 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, 77502723 + 77502724.

It is an arithmetic number, because the mean of its divisors is an integer number (77502724).

Almost surely, 2^155005447 is an apocalyptic number.

155005447 is a deficient number, since it is larger than the sum of its proper divisors (1).

155005447 is an equidigital number, since it uses as much as digits as its factorization.

155005447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14000, while the sum is 31.

The square root of 155005447 is about 12450.1183528511. The cubic root of 155005447 is about 537.1748278014.

Adding to 155005447 its reverse (744500551), we get a palindrome (899505998).

It can be divided in two parts, 15500544 and 7, that added together give a palindrome (15500551).

The spelling of 155005447 in words is "one hundred fifty-five million, five thousand, four hundred forty-seven".