3961561 has 8 divisors (see below), whose sum is σ = 4212000. Its totient is φ = 3713088.

The previous prime is 3961541. The next prime is 3961579. The reversal of 3961561 is 1651693.

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

It is a cyclic number.

It is not a de Polignac number, because 3961561 - 2⁹ = 3961049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3961501) 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 7 ways as a sum of consecutive naturals, for example, 7690 + ... + 8188.

It is an arithmetic number, because the mean of its divisors is an integer number (526500).

Almost surely, 2^3961561 is an apocalyptic number.

It is an amenable number.

3961561 is a deficient number, since it is larger than the sum of its proper divisors (250439).

3961561 is a wasteful number, since it uses less digits than its factorization.

3961561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 983.

The product of its digits is 4860, while the sum is 31.

The square root of 3961561 is about 1990.3670515762. The cubic root of 3961561 is about 158.2299834008.

The spelling of 3961561 in words is "three million, nine hundred sixty-one thousand, five hundred sixty-one".