3751661 has 4 divisors (see below), whose sum is σ = 3772800. Its totient is φ = 3730524.

The previous prime is 3751639. The next prime is 3751663. The reversal of 3751661 is 1661573.

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 an emirpimes, since its reverse is a distinct semiprime: 1661573 = 223 ⋅7451.

It is a cyclic number.

It is not a de Polignac number, because 3751661 - 2⁶ = 3751597 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 (3751663) 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, 10301 + ... + 10658.

It is an arithmetic number, because the mean of its divisors is an integer number (943200).

Almost surely, 2^3751661 is an apocalyptic number.

It is an amenable number.

3751661 is a deficient number, since it is larger than the sum of its proper divisors (21139).

3751661 is a wasteful number, since it uses less digits than its factorization.

3751661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21138.

The product of its digits is 3780, while the sum is 29.

The square root of 3751661 is about 1936.9204939801. The cubic root of 3751661 is about 155.3845601927.

The spelling of 3751661 in words is "three million, seven hundred fifty-one thousand, six hundred sixty-one".