2519681 has 2 divisors, whose sum is σ = 2519682. Its totient is φ = 2519680.

The previous prime is 2519659. The next prime is 2519707. The reversal of 2519681 is 1869152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1537600 + 982081 = 1240^2 + 991^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2519681 is a prime.

It is a super-2 number, since 2×2519681² = 12697584683522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2519611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1259840 + 1259841.

It is an arithmetic number, because the mean of its divisors is an integer number (1259841).

2^2519681 is an apocalyptic number.

It is an amenable number.

2519681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2519681 is an equidigital number, since it uses as much as digits as its factorization.

2519681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 32.

The square root of 2519681 is about 1587.3503079031. The cubic root of 2519681 is about 136.0760999990.

The spelling of 2519681 in words is "two million, five hundred nineteen thousand, six hundred eighty-one".