155551203 has 12 divisors (see below), whose sum is σ = 225488328. Its totient is φ = 103330080.

The previous prime is 155551181. The next prime is 155551223. The reversal of 155551203 is 302155551.

It is not a de Polignac number, because 155551203 - 2¹⁸ = 155289059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155551223) 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 11 ways as a sum of consecutive naturals, for example, 28225 + ... + 33282.

It is an arithmetic number, because the mean of its divisors is an integer number (18790694).

Almost surely, 2^155551203 is an apocalyptic number.

155551203 is a deficient number, since it is larger than the sum of its proper divisors (69937125).

155551203 is a wasteful number, since it uses less digits than its factorization.

155551203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61794 (or 61791 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 27.

The square root of 155551203 is about 12472.0167976154. The cubic root of 155551203 is about 537.8045325296.

The spelling of 155551203 in words is "one hundred fifty-five million, five hundred fifty-one thousand, two hundred three".