298639681 has 2 divisors, whose sum is σ = 298639682. Its totient is φ = 298639680.

The previous prime is 298639673. The next prime is 298639699. The reversal of 298639681 is 186936892.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150798400 + 147841281 = 12280^2 + 12159^2 .

It is a cyclic number.

It is not a de Polignac number, because 298639681 - 2³ = 298639673 is a prime.

It is a super-2 number, since 2×298639681² = 178371318135563522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (298639631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 149319840 + 149319841.

It is an arithmetic number, because the mean of its divisors is an integer number (149319841).

Almost surely, 2^298639681 is an apocalyptic number.

It is an amenable number.

298639681 is a deficient number, since it is larger than the sum of its proper divisors (1).

298639681 is an equidigital number, since it uses as much as digits as its factorization.

298639681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1119744, while the sum is 52.

The square root of 298639681 is about 17281.1944320987. The cubic root of 298639681 is about 668.4195920337.

The spelling of 298639681 in words is "two hundred ninety-eight million, six hundred thirty-nine thousand, six hundred eighty-one".