3911881 has 2 divisors, whose sum is σ = 3911882. Its totient is φ = 3911880.

The previous prime is 3911879. The next prime is 3911911. The reversal of 3911881 is 1881193.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3767481 + 144400 = 1941^2 + 380^2 .

It is a cyclic number.

It is not a de Polignac number, because 3911881 - 2¹ = 3911879 is a prime.

It is a super-2 number, since 2×3911881² = 30605625916322, which contains 22 as substring.

Together with 3911879, it forms a pair of twin primes.

It is a Chen prime.

3911881 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (3911821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1955940 + 1955941.

It is an arithmetic number, because the mean of its divisors is an integer number (1955941).

Almost surely, 2^3911881 is an apocalyptic number.

It is an amenable number.

3911881 is a deficient number, since it is larger than the sum of its proper divisors (1).

3911881 is an equidigital number, since it uses as much as digits as its factorization.

3911881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 31.

The square root of 3911881 is about 1977.8475674328. The cubic root of 3911881 is about 157.5657708007.

The spelling of 3911881 in words is "three million, nine hundred eleven thousand, eight hundred eighty-one".