1321617 has 16 divisors (see below), whose sum is σ = 1990080. Its totient is φ = 772800.

The previous prime is 1321601. The next prime is 1321627. The reversal of 1321617 is 7161231.

It is not a de Polignac number, because 1321617 - 2⁴ = 1321601 is a prime.

1321617 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1321593 and 1321602.

It is not an unprimeable number, because it can be changed into a prime (1321627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 267 + ... + 1647.

It is an arithmetic number, because the mean of its divisors is an integer number (124380).

2^1321617 is an apocalyptic number.

It is an amenable number.

1321617 is a deficient number, since it is larger than the sum of its proper divisors (668463).

1321617 is a wasteful number, since it uses less digits than its factorization.

1321617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1424.

The product of its digits is 252, while the sum is 21.

The square root of 1321617 is about 1149.6160228528. The cubic root of 1321617 is about 109.7409053576.

Adding to 1321617 its reverse (7161231), we get a palindrome (8482848).

It can be divided in two parts, 132 and 1617, that multiplied together give a square (213444 = 462²).

The spelling of 1321617 in words is "one million, three hundred twenty-one thousand, six hundred seventeen".