155840081 has 4 divisors (see below), whose sum is σ = 155870064. Its totient is φ = 155810100.

The previous prime is 155840077. The next prime is 155840093. The reversal of 155840081 is 180048551.

155840081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 155840081 - 2² = 155840077 is a prime.

It is a super-2 number, since 2×155840081² = 48572261692173122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155843081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4955 + ... + 18336.

It is an arithmetic number, because the mean of its divisors is an integer number (38967516).

Almost surely, 2^155840081 is an apocalyptic number.

It is an amenable number.

155840081 is a deficient number, since it is larger than the sum of its proper divisors (29983).

155840081 is an equidigital number, since it uses as much as digits as its factorization.

155840081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29982.

The product of its (nonzero) digits is 6400, while the sum is 32.

The square root of 155840081 is about 12483.5924717206. The cubic root of 155840081 is about 538.1372500306.

The spelling of 155840081 in words is "one hundred fifty-five million, eight hundred forty thousand, eighty-one".