3127661 has 4 divisors (see below), whose sum is σ = 3131232. Its totient is φ = 3124092.

The previous prime is 3127637. The next prime is 3127669. The reversal of 3127661 is 1667213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3127661 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 3127661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3127669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 530 + ... + 2556.

It is an arithmetic number, because the mean of its divisors is an integer number (782808).

Almost surely, 2^3127661 is an apocalyptic number.

It is an amenable number.

3127661 is a deficient number, since it is larger than the sum of its proper divisors (3571).

3127661 is a wasteful number, since it uses less digits than its factorization.

3127661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3570.

The product of its digits is 1512, while the sum is 26.

The square root of 3127661 is about 1768.5194372695. The cubic root of 3127661 is about 146.2423727973.

The spelling of 3127661 in words is "three million, one hundred twenty-seven thousand, six hundred sixty-one".