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1321631 = 1777743
BaseRepresentation
bin101000010101010011111
32111010221022
411002222133
5314243011
644154355
714143103
oct5025237
92433838
101321631
11822a63
125389bb
1337373c
14265903
151b18db
hex142a9f

1321631 has 4 divisors (see below), whose sum is σ = 1399392. Its totient is φ = 1243872.

The previous prime is 1321627. The next prime is 1321633. The reversal of 1321631 is 1361231.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1321631 - 22 = 1321627 is a prime.

It is a super-2 number, since 2×13216312 = 3493417000322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 77743 = 1321631 / (1 + 3 + 2 + 1 + 6 + 3 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38855 + ... + 38888.

It is an arithmetic number, because the mean of its divisors is an integer number (349848).

21321631 is an apocalyptic number.

1321631 is a deficient number, since it is larger than the sum of its proper divisors (77761).

1321631 is an equidigital number, since it uses as much as digits as its factorization.

1321631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77760.

The product of its digits is 108, while the sum is 17.

The square root of 1321631 is about 1149.6221118263. The cubic root of 1321631 is about 109.7412928545.

Adding to 1321631 its reverse (1361231), we get a palindrome (2682862).

The spelling of 1321631 in words is "one million, three hundred twenty-one thousand, six hundred thirty-one".

Divisors: 1 17 77743 1321631