155401805 has 8 divisors (see below), whose sum is σ = 200827032. Its totient is φ = 114758208.

The previous prime is 155401789. The next prime is 155401843. The reversal of 155401805 is 508104551.

155401805 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 797449 + 154604356 = 893^2 + 12434^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 155401805 - 2⁴ = 155401789 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1195334 + ... + 1195463.

It is an arithmetic number, because the mean of its divisors is an integer number (25103379).

Almost surely, 2^155401805 is an apocalyptic number.

It is an amenable number.

155401805 is a deficient number, since it is larger than the sum of its proper divisors (45425227).

155401805 is a wasteful number, since it uses less digits than its factorization.

155401805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2390815.

The product of its (nonzero) digits is 4000, while the sum is 29.

The square root of 155401805 is about 12466.0260307766. The cubic root of 155401805 is about 537.6323005858.

The spelling of 155401805 in words is "one hundred fifty-five million, four hundred one thousand, eight hundred five".