155121230 has 32 divisors (see below), whose sum is σ = 305123328. Its totient is φ = 56311200.

The previous prime is 155121227. The next prime is 155121251. The reversal of 155121230 is 32121551.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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, 108299 + ... + 109721.

It is an arithmetic number, because the mean of its divisors is an integer number (9535104).

Almost surely, 2^155121230 is an apocalyptic number.

155121230 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

155121230 is a deficient number, since it is larger than the sum of its proper divisors (150002098).

155121230 is a wasteful number, since it uses less digits than its factorization.

155121230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2432.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 155121230 is about 12454.7673603323. The cubic root of 155121230 is about 537.3085440349.

Adding to 155121230 its reverse (32121551), we get a palindrome (187242781).

The spelling of 155121230 in words is "one hundred fifty-five million, one hundred twenty-one thousand, two hundred thirty".