155189198 has 4 divisors (see below), whose sum is σ = 232783800. Its totient is φ = 77594598.

The previous prime is 155189183. The next prime is 155189201. The reversal of 155189198 is 891981551.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38797298 + ... + 38797301.

It is an arithmetic number, because the mean of its divisors is an integer number (58195950).

Almost surely, 2^155189198 is an apocalyptic number.

155189198 is a deficient number, since it is larger than the sum of its proper divisors (77594602).

155189198 is an equidigital number, since it uses as much as digits as its factorization.

155189198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77594601.

The product of its digits is 129600, while the sum is 47.

The square root of 155189198 is about 12457.4956552270. The cubic root of 155189198 is about 537.3870083744.

The spelling of 155189198 in words is "one hundred fifty-five million, one hundred eighty-nine thousand, one hundred ninety-eight".