2626781 has 2 divisors, whose sum is σ = 2626782. Its totient is φ = 2626780.

The previous prime is 2626777. The next prime is 2626801. The reversal of 2626781 is 1876262.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2088025 + 538756 = 1445^2 + 734^2 .

It is a cyclic number.

It is not a de Polignac number, because 2626781 - 2² = 2626777 is a prime.

It is a super-2 number, since 2×2626781² = 13799956843922, which contains 22 as substring.

It is a Chen prime.

It is an Ulam number.

It is equal to p₁₉₁₆₆₉ and since 2626781 and 191669 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2626751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1313390 + 1313391.

It is an arithmetic number, because the mean of its divisors is an integer number (1313391).

2^2626781 is an apocalyptic number.

It is an amenable number.

2626781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2626781 is an equidigital number, since it uses as much as digits as its factorization.

2626781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 32.

The square root of 2626781 is about 1620.7347099387. The cubic root of 2626781 is about 137.9773995055.

The spelling of 2626781 in words is "two million, six hundred twenty-six thousand, seven hundred eighty-one".