3891161 has 2 divisors, whose sum is σ = 3891162. Its totient is φ = 3891160.

The previous prime is 3891157. The next prime is 3891197. The reversal of 3891161 is 1611983.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2496400 + 1394761 = 1580^2 + 1181^2 .

It is a cyclic number.

It is not a de Polignac number, because 3891161 - 2² = 3891157 is a prime.

It is a super-2 number, since 2×3891161² = 30282267855842, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3891131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1945580 + 1945581.

It is an arithmetic number, because the mean of its divisors is an integer number (1945581).

Almost surely, 2^3891161 is an apocalyptic number.

It is an amenable number.

3891161 is a deficient number, since it is larger than the sum of its proper divisors (1).

3891161 is an equidigital number, since it uses as much as digits as its factorization.

3891161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 29.

The square root of 3891161 is about 1972.6025955575. The cubic root of 3891161 is about 157.2870861192.

The spelling of 3891161 in words is "three million, eight hundred ninety-one thousand, one hundred sixty-one".