2634781 has 2 divisors, whose sum is σ = 2634782. Its totient is φ = 2634780.

The previous prime is 2634769. The next prime is 2634791. The reversal of 2634781 is 1874362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2374681 + 260100 = 1541^2 + 510^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2634781 is a prime.

It is a super-2 number, since 2×2634781² = 13884141835922, which contains 22 as substring.

It is a d-powerful number, because it can be written as 2¹¹ + 6² + 3¹² + 4⁶ + 7 + 8⁷ + 1 .

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2634761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1317390 + 1317391.

It is an arithmetic number, because the mean of its divisors is an integer number (1317391).

2^2634781 is an apocalyptic number.

It is an amenable number.

2634781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2634781 is an equidigital number, since it uses as much as digits as its factorization.

2634781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 31.

The square root of 2634781 is about 1623.2008501723. The cubic root of 2634781 is about 138.1173300273.

The spelling of 2634781 in words is "two million, six hundred thirty-four thousand, seven hundred eighty-one".