155449471 has 2 divisors, whose sum is σ = 155449472. Its totient is φ = 155449470.

The previous prime is 155449453. The next prime is 155449487. The reversal of 155449471 is 174944551.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155449471 is a prime.

It is a super-3 number, since 3×155449471³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155449421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77724735 + 77724736.

It is an arithmetic number, because the mean of its divisors is an integer number (77724736).

Almost surely, 2^155449471 is an apocalyptic number.

155449471 is a deficient number, since it is larger than the sum of its proper divisors (1).

155449471 is an equidigital number, since it uses as much as digits as its factorization.

155449471 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100800, while the sum is 40.

The square root of 155449471 is about 12467.9377204091. The cubic root of 155449471 is about 537.6872638289.

The spelling of 155449471 in words is "one hundred fifty-five million, four hundred forty-nine thousand, four hundred seventy-one".