1626982681 has 2 divisors, whose sum is σ = 1626982682. Its totient is φ = 1626982680.

The previous prime is 1626982663. The next prime is 1626982733. The reversal of 1626982681 is 1862896261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1622800656 + 4182025 = 40284^2 + 2045^2 .

It is a cyclic number.

It is not a de Polignac number, because 1626982681 - 2¹⁷ = 1626851609 is a prime.

It is a super-2 number, since 2×1626982681² = 5294145288547895522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1626982601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 813491340 + 813491341.

It is an arithmetic number, because the mean of its divisors is an integer number (813491341).

Almost surely, 2^1626982681 is an apocalyptic number.

It is an amenable number.

1626982681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1626982681 is an equidigital number, since it uses as much as digits as its factorization.

1626982681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 497664, while the sum is 49.

The square root of 1626982681 is about 40335.8733759417. The cubic root of 1626982681 is about 1176.1452978976.

The spelling of 1626982681 in words is "one billion, six hundred twenty-six million, nine hundred eighty-two thousand, six hundred eighty-one".