155122231 has 8 divisors (see below), whose sum is σ = 172825344. Its totient is φ = 138019320.

The previous prime is 155122217. The next prime is 155122243. The reversal of 155122231 is 132221551.

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

It is a cyclic number.

It is not a de Polignac number, because 155122231 - 2¹¹ = 155120183 is a prime.

It is a super-2 number, since 2×155122231² = 48125813100834722, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155122831) 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, 149505 + ... + 150538.

It is an arithmetic number, because the mean of its divisors is an integer number (21603168).

Almost surely, 2^155122231 is an apocalyptic number.

155122231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

155122231 is a deficient number, since it is larger than the sum of its proper divisors (17703113).

155122231 is a wasteful number, since it uses less digits than its factorization.

155122231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300101.

The product of its digits is 600, while the sum is 22.

The square root of 155122231 is about 12454.8075456829. The cubic root of 155122231 is about 537.3096997862.

Adding to 155122231 its reverse (132221551), we get a palindrome (287343782).

The spelling of 155122231 in words is "one hundred fifty-five million, one hundred twenty-two thousand, two hundred thirty-one".