155125321 has 8 divisors (see below), whose sum is σ = 172819080. Its totient is φ = 138254592.

The previous prime is 155125303. The next prime is 155125351. The reversal of 155125321 is 123521551.

It can be written as a sum of positive squares in 4 ways, for example, as 6553600 + 148571721 = 2560^2 + 12189^2 .

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 155125321 - 2²³ = 146736713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155125351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 205360 + ... + 206113.

It is an arithmetic number, because the mean of its divisors is an integer number (21602385).

Almost surely, 2^155125321 is an apocalyptic number.

It is an amenable number.

155125321 is a deficient number, since it is larger than the sum of its proper divisors (17693759).

155125321 is a wasteful number, since it uses less digits than its factorization.

155125321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411515.

The product of its digits is 1500, while the sum is 25.

The square root of 155125321 is about 12454.9315935496. The cubic root of 155125321 is about 537.3132674587.

Adding to 155125321 its reverse (123521551), we get a palindrome (278646872).

The spelling of 155125321 in words is "one hundred fifty-five million, one hundred twenty-five thousand, three hundred twenty-one".