1321125 has 32 divisors (see below), whose sum is σ = 2376192. Its totient is φ = 648000.

The previous prime is 1321109. The next prime is 1321139. The reversal of 1321125 is 5211231.

1321125 is a nontrivial binomial coefficient, being equal to C(1626, 2).

It is not a de Polignac number, because 1321125 - 2⁴ = 1321109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4740 + ... + 5010.

It is an arithmetic number, because the mean of its divisors is an integer number (74256).

2^1321125 is an apocalyptic number.

1321125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1321125 is the 1625-th triangular number and also the 813-rd hexagonal number.

It is an amenable number.

1321125 is a deficient number, since it is larger than the sum of its proper divisors (1055067).

1321125 is a wasteful number, since it uses less digits than its factorization.

1321125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302 (or 292 counting only the distinct ones).

The product of its digits is 60, while the sum is 15.

The square root of 1321125 is about 1149.4020184426. The cubic root of 1321125 is about 109.7272858731.

Adding to 1321125 its reverse (5211231), we get a palindrome (6532356).

It can be divided in two parts, 13 and 21125, that multiplied together give a cube (274625 = 65³).

The spelling of 1321125 in words is "one million, three hundred twenty-one thousand, one hundred twenty-five".