2519981 has 2 divisors, whose sum is σ = 2519982. Its totient is φ = 2519980.

The previous prime is 2519977. The next prime is 2520017. The reversal of 2519981 is 1899152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2449225 + 70756 = 1565^2 + 266^2 .

It is a cyclic number.

It is not a de Polignac number, because 2519981 - 2² = 2519977 is a prime.

It is a super-2 number, since 2×2519981² = 12700608480722, 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 (2519911) 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, 1259990 + 1259991.

It is an arithmetic number, because the mean of its divisors is an integer number (1259991).

2^2519981 is an apocalyptic number.

It is an amenable number.

2519981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2519981 is an equidigital number, since it uses as much as digits as its factorization.

2519981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 35.

The square root of 2519981 is about 1587.4448021900. Note that the first 3 decimals coincide. The cubic root of 2519981 is about 136.0815003136.

The spelling of 2519981 in words is "two million, five hundred nineteen thousand, nine hundred eighty-one".