1561115 has 16 divisors (see below), whose sum is σ = 1967328. Its totient is φ = 1188096.

The previous prime is 1561111. The next prime is 1561117. The reversal of 1561115 is 5111651.

It is a cyclic number.

It is not a de Polignac number, because 1561115 - 2² = 1561111 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1561111) 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, 11327 + ... + 11463.

It is an arithmetic number, because the mean of its divisors is an integer number (122958).

2^1561115 is an apocalyptic number.

1561115 is a deficient number, since it is larger than the sum of its proper divisors (406213).

1561115 is a wasteful number, since it uses less digits than its factorization.

1561115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238.

The product of its digits is 150, while the sum is 20.

The square root of 1561115 is about 1249.4458771792. The cubic root of 1561115 is about 116.0054248355.

Adding to 1561115 its reverse (5111651), we get a palindrome (6672766).

The spelling of 1561115 in words is "one million, five hundred sixty-one thousand, one hundred fifteen".