155426081 has 2 divisors, whose sum is σ = 155426082. Its totient is φ = 155426080.

The previous prime is 155426077. The next prime is 155426083. The reversal of 155426081 is 180624551.

155426081 = 8815² + 8816².

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77721856 + 77704225 = 8816^2 + 8815^2 .

It is an emirp because it is prime and its reverse (180624551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155426081 - 2² = 155426077 is a prime.

It is a super-2 number, since 2×155426081² = 48314533310037122, which contains 22 as substring.

Together with 155426083, 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 (155426083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77713040 + 77713041.

It is an arithmetic number, because the mean of its divisors is an integer number (77713041).

Almost surely, 2^155426081 is an apocalyptic number.

155426081 is the 8816-th centered square number.

It is an amenable number.

155426081 is a deficient number, since it is larger than the sum of its proper divisors (1).

155426081 is an equidigital number, since it uses as much as digits as its factorization.

155426081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 155426081 is about 12466.9996791530. Note that the first 3 decimals coincide. The cubic root of 155426081 is about 537.6602944309.

The spelling of 155426081 in words is "one hundred fifty-five million, four hundred twenty-six thousand, eighty-one".