1661115 has 32 divisors (see below), whose sum is σ = 2834496. Its totient is φ = 829440.

The previous prime is 1661111. The next prime is 1661117. The reversal of 1661115 is 5111661.

It is not a de Polignac number, because 1661115 - 2² = 1661111 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1661091 and 1661100.

It is not an unprimeable number, because it can be changed into a prime (1661111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22719 + ... + 22791.

It is an arithmetic number, because the mean of its divisors is an integer number (88578).

2^1661115 is an apocalyptic number.

1661115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1661115 is a deficient number, since it is larger than the sum of its proper divisors (1173381).

1661115 is a wasteful number, since it uses less digits than its factorization.

1661115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159.

The product of its digits is 180, while the sum is 21.

The square root of 1661115 is about 1288.8425039546. The cubic root of 1661115 is about 118.4313191359.

Adding to 1661115 its reverse (5111661), we get a palindrome (6772776).

The spelling of 1661115 in words is "one million, six hundred sixty-one thousand, one hundred fifteen".