155383891 has 16 divisors (see below), whose sum is σ = 172081728. Its totient is φ = 139392000.

The previous prime is 155383889. The next prime is 155383901. The reversal of 155383891 is 198383551.

It is a cyclic number.

It is not a de Polignac number, because 155383891 - 2¹ = 155383889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155383801) 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, 213370 + ... + 214096.

It is an arithmetic number, because the mean of its divisors is an integer number (10755108).

Almost surely, 2^155383891 is an apocalyptic number.

155383891 is a deficient number, since it is larger than the sum of its proper divisors (16697837).

155383891 is a wasteful number, since it uses less digits than its factorization.

155383891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1182.

The product of its digits is 129600, while the sum is 43.

The square root of 155383891 is about 12465.3074972100. The cubic root of 155383891 is about 537.6116412052.

The spelling of 155383891 in words is "one hundred fifty-five million, three hundred eighty-three thousand, eight hundred ninety-one".