6291881 has 2 divisors, whose sum is σ = 6291882. Its totient is φ = 6291880.

The previous prime is 6291863. The next prime is 6291893. The reversal of 6291881 is 1881926.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5331481 + 960400 = 2309^2 + 980^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6291881 is a prime.

It is a super-2 number, since 2×6291881² = 79175533036322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6291821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3145940 + 3145941.

It is an arithmetic number, because the mean of its divisors is an integer number (3145941).

Almost surely, 2^6291881 is an apocalyptic number.

It is an amenable number.

6291881 is a deficient number, since it is larger than the sum of its proper divisors (1).

6291881 is an equidigital number, since it uses as much as digits as its factorization.

6291881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 35.

The square root of 6291881 is about 2508.3622146732. The cubic root of 6291881 is about 184.6121017801.

The spelling of 6291881 in words is "six million, two hundred ninety-one thousand, eight hundred eighty-one".