151321 has 3 divisors (see below), whose sum is σ = 151711. Its totient is φ = 150932.

The previous prime is 151303. The next prime is 151337. The reversal of 151321 is 123151.

151321 = T₃₈₈ + T₃₈₉.

The square root of 151321 is 389.

It is a perfect power (a square), and thus also a powerful number.

151321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 35721 + 115600 = 189^2 + 340^2 .

It is not a de Polignac number, because 151321 - 2⁵ = 151289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (151381) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 195 + ... + 583.

2¹⁵¹³²¹ is an apocalyptic number.

151321 is the 389-th square number.

151321 is the 195-th centered octagonal number.

It is an amenable number.

151321 is a deficient number, since it is larger than the sum of its proper divisors (390).

151321 is an frugal number, since it uses more digits than its factorization.

151321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778 (or 389 counting only the distinct ones).

The product of its digits is 30, while the sum is 13.

The cubic root of 151321 is about 53.2884474773.

Adding to 151321 its reverse (123151), we get a palindrome (274472).

The spelling of 151321 in words is "one hundred fifty-one thousand, three hundred twenty-one".