1535 has 4 divisors (see below), whose sum is σ = 1848. Its totient is φ = 1224.

The previous prime is 1531. The next prime is 1543. The reversal of 1535 is 5351.

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 1535 - 2² = 1531 is a prime.

It is a Duffinian number.

It is a plaindrome in base 4, base 8 and base 16.

It is a nialpdrome in base 7 and base 13.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149 + ... + 158.

It is an arithmetic number, because the mean of its divisors is an integer number (462).

2¹⁵³⁵ is an apocalyptic number.

1535 is a deficient number, since it is larger than the sum of its proper divisors (313).

1535 is an equidigital number, since it uses as much as digits as its factorization.

1535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312.

The product of its digits is 75, while the sum is 14.

The square root of 1535 is about 39.1790760483. The cubic root of 1535 is about 11.5354921134.

Subtracting from 1535 its sum of digits (14), we obtain a square (1521 = 39²).

Adding to 1535 its reverse (5351), we get a palindrome (6886).

It can be divided in two parts, 15 and 35, that multiplied together give a palindrome (525).

The spelling of 1535 in words is "one thousand, five hundred thirty-five".