3961961 has 2 divisors, whose sum is σ = 3961962. Its totient is φ = 3961960.

The previous prime is 3961949. The next prime is 3961963. The reversal of 3961961 is 1691693.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2190400 + 1771561 = 1480^2 + 1331^2 .

It is an emirp because it is prime and its reverse (1691693) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3961961 - 2⁶ = 3961897 is a prime.

Together with 3961963, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3961963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1980980 + 1980981.

It is an arithmetic number, because the mean of its divisors is an integer number (1980981).

Almost surely, 2^3961961 is an apocalyptic number.

It is an amenable number.

3961961 is a deficient number, since it is larger than the sum of its proper divisors (1).

3961961 is an equidigital number, since it uses as much as digits as its factorization.

3961961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8748, while the sum is 35.

The square root of 3961961 is about 1990.4675330183. The cubic root of 3961961 is about 158.2353087312.

The spelling of 3961961 in words is "three million, nine hundred sixty-one thousand, nine hundred sixty-one".