153121 has 4 divisors (see below), whose sum is σ = 161200. Its totient is φ = 145044.

The previous prime is 153113. The next prime is 153133. The reversal of 153121 is 121351.

153121 = T₃₁₈ + T₃₁₉ + T₃₂₀.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 153121 - 2³ = 153113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (153151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4011 + ... + 4048.

It is an arithmetic number, because the mean of its divisors is an integer number (40300).

2¹⁵³¹²¹ is an apocalyptic number.

153121 is the 320-th centered triangular number.

It is an amenable number.

153121 is a deficient number, since it is larger than the sum of its proper divisors (8079).

153121 is an equidigital number, since it uses as much as digits as its factorization.

153121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8078.

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

The square root of 153121 is about 391.3067850166. The cubic root of 153121 is about 53.4989081793.

Adding to 153121 its reverse (121351), we get a palindrome (274472).

It can be divided in two parts, 15 and 3121, that added together give a square (3136 = 56²).

The spelling of 153121 in words is "one hundred fifty-three thousand, one hundred twenty-one".