1121661 has 8 divisors (see below), whose sum is σ = 1661760. Its totient is φ = 747756.

The previous prime is 1121651. The next prime is 1121671. The reversal of 1121661 is 1661211.

1121661 is a `hidden beast` number, since 1 + 1 + 2 + 1 + 661 = 666.

It is an interprime number because it is at equal distance from previous prime (1121651) and next prime (1121671).

It is not a de Polignac number, because 1121661 - 2⁵ = 1121629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20745 + ... + 20798.

It is an arithmetic number, because the mean of its divisors is an integer number (207720).

2^1121661 is an apocalyptic number.

It is an amenable number.

1121661 is a deficient number, since it is larger than the sum of its proper divisors (540099).

1121661 is an equidigital number, since it uses as much as digits as its factorization.

1121661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41552 (or 41546 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

The square root of 1121661 is about 1059.0849824259. The cubic root of 1121661 is about 103.9011943740.

Adding to 1121661 its reverse (1661211), we get a palindrome (2782872).

The spelling of 1121661 in words is "one million, one hundred twenty-one thousand, six hundred sixty-one".