2139811 has 2 divisors, whose sum is σ = 2139812. Its totient is φ = 2139810.

The previous prime is 2139757. The next prime is 2139817. The reversal of 2139811 is 1189312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2139811 - 2¹¹ = 2137763 is a prime.

It is a super-2 number, since 2×2139811² = 9157582231442, which contains 22 as substring.

It is equal to p₁₅₈₅₄₂ and since 2139811 and 158542 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (2139817) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069905 + 1069906.

It is an arithmetic number, because the mean of its divisors is an integer number (1069906).

2^2139811 is an apocalyptic number.

2139811 is a deficient number, since it is larger than the sum of its proper divisors (1).

2139811 is an equidigital number, since it uses as much as digits as its factorization.

2139811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 25.

The square root of 2139811 is about 1462.8092835363. The cubic root of 2139811 is about 128.8620804275.

The spelling of 2139811 in words is "two million, one hundred thirty-nine thousand, eight hundred eleven".