1615 has 8 divisors (see below), whose sum is σ = 2160. Its totient is φ = 1152.

The previous prime is 1613. The next prime is 1619. The reversal of 1615 is 5161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 7-Lehmer number, since φ(1615) divides (1615-1)⁷.

It is a cyclic number.

It is not a de Polignac number, because 1615 - 2¹ = 1613 is a prime.

It is a plaindrome in base 11.

It is a nialpdrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 1595 and 1604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76 + ... + 94.

It is an arithmetic number, because the mean of its divisors is an integer number (270).

1615 is a deficient number, since it is larger than the sum of its proper divisors (545).

1615 is a wasteful number, since it uses less digits than its factorization.

1615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41.

The product of its digits is 30, while the sum is 13.

The square root of 1615 is about 40.1870625948. The cubic root of 1615 is about 11.7325075463.

Adding to 1615 its reverse (5161), we get a palindrome (6776).

It can be divided in two parts, 1 and 615, that added together give a palindrome (616).

The spelling of 1615 in words is "one thousand, six hundred fifteen".