155555231 has 8 divisors (see below), whose sum is σ = 167669040. Its totient is φ = 143462592.

The previous prime is 155555221. The next prime is 155555237. The reversal of 155555231 is 132555551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 155555231 - 2¹⁴ = 155538847 is a prime.

It is a super-2 number, since 2×155555231² = 48394859782926722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155555237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12116 + ... + 21398.

It is an arithmetic number, because the mean of its divisors is an integer number (20958630).

Almost surely, 2^155555231 is an apocalyptic number.

155555231 is a deficient number, since it is larger than the sum of its proper divisors (12113809).

155555231 is a wasteful number, since it uses less digits than its factorization.

155555231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10585.

The product of its digits is 18750, while the sum is 32.

The square root of 155555231 is about 12472.1782780716. The cubic root of 155555231 is about 537.8091746409.

The spelling of 155555231 in words is "one hundred fifty-five million, five hundred fifty-five thousand, two hundred thirty-one".