155541681 has 8 divisors (see below), whose sum is σ = 230432160. Its totient is φ = 103694436.

The previous prime is 155541677. The next prime is 155541689. The reversal of 155541681 is 186145551.

155541681 is a `hidden beast` number, since 1 + 55 + 541 + 68 + 1 = 666.

It is not a de Polignac number, because 155541681 - 2² = 155541677 is a prime.

It is a super-2 number, since 2×155541681² = 48386429056611522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155541689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2880375 + ... + 2880428.

It is an arithmetic number, because the mean of its divisors is an integer number (28804020).

Almost surely, 2^155541681 is an apocalyptic number.

It is an amenable number.

155541681 is a deficient number, since it is larger than the sum of its proper divisors (74890479).

155541681 is an equidigital number, since it uses as much as digits as its factorization.

155541681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5760812 (or 5760806 counting only the distinct ones).

The product of its digits is 24000, while the sum is 36.

The square root of 155541681 is about 12471.6350572008. The cubic root of 155541681 is about 537.7935584813.

The spelling of 155541681 in words is "one hundred fifty-five million, five hundred forty-one thousand, six hundred eighty-one".