155081 has 2 divisors, whose sum is σ = 155082. Its totient is φ = 155080.

The previous prime is 155069. The next prime is 155083. The reversal of 155081 is 180551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99856 + 55225 = 316^2 + 235^2 .

It is a cyclic number.

It is not a de Polignac number, because 155081 - 2⁶ = 155017 is a prime.

It is a super-2 number, since 2×155081² = 48100233122, which contains 22 as substring.

Together with 155083, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (155083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77540 + 77541.

It is an arithmetic number, because the mean of its divisors is an integer number (77541).

2¹⁵⁵⁰⁸¹ is an apocalyptic number.

It is an amenable number.

155081 is a deficient number, since it is larger than the sum of its proper divisors (1).

155081 is an equidigital number, since it uses as much as digits as its factorization.

155081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 155081 is about 393.8032503675. The cubic root of 155081 is about 53.7262090493.

The spelling of 155081 in words is "one hundred fifty-five thousand, eighty-one".