3961401161 has 4 divisors (see below), whose sum is σ = 3962620692. Its totient is φ = 3960181632.

The previous prime is 3961401151. The next prime is 3961401163. The reversal of 3961401161 is 1611041693.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1611041693 = 23 ⋅70045291.

It can be written as a sum of positive squares in 2 ways, for example, as 2783195536 + 1178205625 = 52756^2 + 34325^2 .

It is a cyclic number.

It is not a de Polignac number, because 3961401161 - 2¹⁰ = 3961400137 is a prime.

It is a super-4 number, since 4×3961401161⁴ (a number of 39 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3961401163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 604880 + ... + 611393.

It is an arithmetic number, because the mean of its divisors is an integer number (990655173).

Almost surely, 2^3961401161 is an apocalyptic number.

It is an amenable number.

3961401161 is a deficient number, since it is larger than the sum of its proper divisors (1219531).

3961401161 is a wasteful number, since it uses less digits than its factorization.

3961401161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1219530.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 3961401161 is about 62939.6628605524. The cubic root of 3961401161 is about 1582.2785531189.

The spelling of 3961401161 in words is "three billion, nine hundred sixty-one million, four hundred one thousand, one hundred sixty-one".