155890191 has 16 divisors (see below), whose sum is σ = 210469376. Its totient is φ = 102625056.

The previous prime is 155890183. The next prime is 155890201. The reversal of 155890191 is 191098551.

It is not a de Polignac number, because 155890191 - 2³ = 155890183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155890151) 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, 189006 + ... + 189828.

It is an arithmetic number, because the mean of its divisors is an integer number (13154336).

Almost surely, 2^155890191 is an apocalyptic number.

155890191 is a deficient number, since it is larger than the sum of its proper divisors (54579185).

155890191 is a wasteful number, since it uses less digits than its factorization.

155890191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1542.

The product of its (nonzero) digits is 16200, while the sum is 39.

The square root of 155890191 is about 12485.5993448452. The cubic root of 155890191 is about 538.1949227586.

The spelling of 155890191 in words is "one hundred fifty-five million, eight hundred ninety thousand, one hundred ninety-one".