2602781 has 2 divisors, whose sum is σ = 2602782. Its totient is φ = 2602780.

The previous prime is 2602771. The next prime is 2602783. The reversal of 2602781 is 1872062.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1359556 + 1243225 = 1166^2 + 1115^2 .

It is a cyclic number.

It is not a de Polignac number, because 2602781 - 2¹⁰ = 2601757 is a prime.

It is a super-2 number, since 2×2602781² = 13548937867922, which contains 22 as substring.

Together with 2602783, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2602781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2602783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1301390 + 1301391.

It is an arithmetic number, because the mean of its divisors is an integer number (1301391).

2^2602781 is an apocalyptic number.

It is an amenable number.

2602781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2602781 is an equidigital number, since it uses as much as digits as its factorization.

2602781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 2602781 is about 1613.3136706791. The cubic root of 2602781 is about 137.5558957318. Note that the first 3 decimals are identical.

The spelling of 2602781 in words is "two million, six hundred two thousand, seven hundred eighty-one".