155855247 has 4 divisors (see below), whose sum is σ = 207807000. Its totient is φ = 103903496.

The previous prime is 155855213. The next prime is 155855257. The reversal of 155855247 is 742558551.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 155855247 - 2¹⁴ = 155838863 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 155855199 and 155855208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155855257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25975872 + ... + 25975877.

It is an arithmetic number, because the mean of its divisors is an integer number (51951750).

Almost surely, 2^155855247 is an apocalyptic number.

155855247 is a deficient number, since it is larger than the sum of its proper divisors (51951753).

155855247 is an equidigital number, since it uses as much as digits as its factorization.

155855247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51951752.

The product of its digits is 280000, while the sum is 42.

The square root of 155855247 is about 12484.1998942664. The cubic root of 155855247 is about 538.1547062262.

The spelling of 155855247 in words is "one hundred fifty-five million, eight hundred fifty-five thousand, two hundred forty-seven".