155131227 has 16 divisors (see below), whose sum is σ = 232197280. Its totient is φ = 102352896.

The previous prime is 155131213. The next prime is 155131231. The reversal of 155131227 is 722131551.

It is not a de Polignac number, because 155131227 - 2¹⁵ = 155098459 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 155131227.

It is not an unprimeable number, because it can be changed into a prime (155131247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26998 + ... + 32235.

It is an arithmetic number, because the mean of its divisors is an integer number (14512330).

Almost surely, 2^155131227 is an apocalyptic number.

155131227 is a deficient number, since it is larger than the sum of its proper divisors (77066053).

155131227 is an equidigital number, since it uses as much as digits as its factorization.

155131227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59339 (or 59333 counting only the distinct ones).

The product of its digits is 2100, while the sum is 27.

The square root of 155131227 is about 12455.1686861319. The cubic root of 155131227 is about 537.3200863151.

Adding to 155131227 its reverse (722131551), we get a palindrome (877262778).

The spelling of 155131227 in words is "one hundred fifty-five million, one hundred thirty-one thousand, two hundred twenty-seven".