155420801 has 2 divisors, whose sum is σ = 155420802. Its totient is φ = 155420800.

The previous prime is 155420767. The next prime is 155420803. The reversal of 155420801 is 108024551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 126787600 + 28633201 = 11260^2 + 5351^2 .

It is a cyclic number.

It is not a de Polignac number, because 155420801 - 2¹⁰ = 155419777 is a prime.

It is a Sophie Germain prime.

Together with 155420803, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (155420803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77710400 + 77710401.

It is an arithmetic number, because the mean of its divisors is an integer number (77710401).

Almost surely, 2^155420801 is an apocalyptic number.

It is an amenable number.

155420801 is a deficient number, since it is larger than the sum of its proper divisors (1).

155420801 is an equidigital number, since it uses as much as digits as its factorization.

155420801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 155420801 is about 12466.7879183052. The cubic root of 155420801 is about 537.6542060523.

The spelling of 155420801 in words is "one hundred fifty-five million, four hundred twenty thousand, eight hundred one".