1011661 has 8 divisors (see below), whose sum is σ = 1183424. Its totient is φ = 846720.

The previous prime is 1011649. The next prime is 1011667. The reversal of 1011661 is 1661101.

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

It is not a de Polignac number, because 1011661 - 2¹³ = 1003469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011667) 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, 1380 + ... + 1981.

It is an arithmetic number, because the mean of its divisors is an integer number (147928).

2^1011661 is an apocalyptic number.

It is an amenable number.

1011661 is a deficient number, since it is larger than the sum of its proper divisors (171763).

1011661 is an equidigital number, since it uses as much as digits as its factorization.

1011661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3411.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 1011661 is about 1005.8136010216. The cubic root of 1011661 is about 100.3871988356.

Adding to 1011661 its reverse (1661101), we get a palindrome (2672762).

It can be divided in two parts, 101 and 1661, that multiplied together give a palindrome (167761).

The spelling of 1011661 in words is "one million, eleven thousand, six hundred sixty-one".