3091661 has 16 divisors (see below), whose sum is σ = 3494400. Its totient is φ = 2721600.

The previous prime is 3091643. The next prime is 3091703. The reversal of 3091661 is 1661903.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3091661 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3091661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3091261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16991 + ... + 17171.

It is an arithmetic number, because the mean of its divisors is an integer number (218400).

Almost surely, 2^3091661 is an apocalyptic number.

3091661 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3091661 is a deficient number, since it is larger than the sum of its proper divisors (402739).

3091661 is a wasteful number, since it uses less digits than its factorization.

3091661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 3091661 is about 1758.3119745938. The cubic root of 3091661 is about 145.6791132313.

The spelling of 3091661 in words is "three million, ninety-one thousand, six hundred sixty-one".