155441581 has 2 divisors, whose sum is σ = 155441582. Its totient is φ = 155441580.

The previous prime is 155441563. The next prime is 155441593. The reversal of 155441581 is 185144551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154604356 + 837225 = 12434^2 + 915^2 .

It is an emirp because it is prime and its reverse (185144551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155441581 - 2⁷ = 155441453 is a prime.

It is a super-2 number, since 2×155441581² = 48324170207559122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155441501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77720790 + 77720791.

It is an arithmetic number, because the mean of its divisors is an integer number (77720791).

Almost surely, 2^155441581 is an apocalyptic number.

It is an amenable number.

155441581 is a deficient number, since it is larger than the sum of its proper divisors (1).

155441581 is an equidigital number, since it uses as much as digits as its factorization.

155441581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16000, while the sum is 34.

The square root of 155441581 is about 12467.6213048039. The cubic root of 155441581 is about 537.6781667157.

The spelling of 155441581 in words is "one hundred fifty-five million, four hundred forty-one thousand, five hundred eighty-one".