155601321 has 8 divisors (see below), whose sum is σ = 207830304. Its totient is φ = 103553280.

The previous prime is 155601319. The next prime is 155601331. The reversal of 155601321 is 123106551.

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

It is not a de Polignac number, because 155601321 - 2¹ = 155601319 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 155601291 and 155601300.

It is not an unprimeable number, because it can be changed into a prime (155601311) 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, 43215 + ... + 46676.

It is an arithmetic number, because the mean of its divisors is an integer number (25978788).

Almost surely, 2^155601321 is an apocalyptic number.

It is an amenable number.

155601321 is a deficient number, since it is larger than the sum of its proper divisors (52228983).

155601321 is an equidigital number, since it uses as much as digits as its factorization.

155601321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90471.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 155601321 is about 12474.0258537491. The cubic root of 155601321 is about 537.8622858455.

Adding to 155601321 its reverse (123106551), we get a palindrome (278707872).

The spelling of 155601321 in words is "one hundred fifty-five million, six hundred one thousand, three hundred twenty-one".