155381863 has 16 divisors (see below), whose sum is σ = 191543296. Its totient is φ = 122744160.

The previous prime is 155381839. The next prime is 155381879. The reversal of 155381863 is 368183551.

It is not a de Polignac number, because 155381863 - 2⁹ = 155381351 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155381263) 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 15 ways as a sum of consecutive naturals, for example, 89320 + ... + 91042.

It is an arithmetic number, because the mean of its divisors is an integer number (11971456).

Almost surely, 2^155381863 is an apocalyptic number.

155381863 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

155381863 is a deficient number, since it is larger than the sum of its proper divisors (36161433).

155381863 is a wasteful number, since it uses less digits than its factorization.

155381863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2734.

The product of its digits is 86400, while the sum is 40.

The square root of 155381863 is about 12465.2261511775. The cubic root of 155381863 is about 537.6093023073.

The spelling of 155381863 in words is "one hundred fifty-five million, three hundred eighty-one thousand, eight hundred sixty-three".