2780131 has 2 divisors, whose sum is σ = 2780132. Its totient is φ = 2780130.

The previous prime is 2780123. The next prime is 2780149. The reversal of 2780131 is 1310872.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2780131 - 2³ = 2780123 is a prime.

It is a super-2 number, since 2×2780131² = 15458256754322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2780101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1390065 + 1390066.

It is an arithmetic number, because the mean of its divisors is an integer number (1390066).

2^2780131 is an apocalyptic number.

2780131 is a deficient number, since it is larger than the sum of its proper divisors (1).

2780131 is an equidigital number, since it uses as much as digits as its factorization.

2780131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 2780131 is about 1667.3724838800. The cubic root of 2780131 is about 140.6117953692.

The spelling of 2780131 in words is "two million, seven hundred eighty thousand, one hundred thirty-one".