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1369 = 372
BaseRepresentation
bin10101011001
31212201
4111121
520434
610201
73664
oct2531
91781
101369
111035
12961
13814
146db
15614
hex559

1369 has 3 divisors (see below), whose sum is σ = 1407. Its totient is φ = 1332.

The previous prime is 1367. The next prime is 1373. The reversal of 1369 is 9631.

1369 = T36 + T37.

The square root of 1369 is 37.

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

1369 is nontrivially palindromic in base 6.

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., 1225 + 144 = 35^2 + 12^2 .

It is not a de Polignac number, because 1369 - 21 = 1367 is a prime.

It is a super-2 number, since 2×13692 = 3748322, which contains 22 as substring.

It is a Duffinian number.

1369 is a lucky number.

It is a plaindrome in base 10 and base 16.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (1361) 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, 19 + ... + 55.

It is an arithmetic number, because the mean of its divisors is an integer number (469).

1369 is the 37-th square number.

1369 is the 19-th centered octagonal number.

It is an amenable number.

1369 is a deficient number, since it is larger than the sum of its proper divisors (38).

1369 is an frugal number, since it uses more digits than its factorization.

1369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74 (or 37 counting only the distinct ones).

The product of its digits is 162, while the sum is 19.

The cubic root of 1369 is about 11.1037024686.

The spelling of 1369 in words is "one thousand, three hundred sixty-nine".

Divisors: 1 37 1369