909898981 has 2 divisors, whose sum is σ = 909898982. Its totient is φ = 909898980.

The previous prime is 909898943. The next prime is 909899027. The reversal of 909898981 is 189898909.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 494350756 + 415548225 = 22234^2 + 20385^2 .

It is a cyclic number.

It is not a de Polignac number, because 909898981 - 2¹³ = 909890789 is a prime.

It is a super-2 number, since 2×909898981² = 1655832311249676722, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (909298981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 454949490 + 454949491.

It is an arithmetic number, because the mean of its divisors is an integer number (454949491).

Almost surely, 2^909898981 is an apocalyptic number.

It is an amenable number.

909898981 is a deficient number, since it is larger than the sum of its proper divisors (1).

909898981 is an equidigital number, since it uses as much as digits as its factorization.

909898981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3359232, while the sum is 61.

The square root of 909898981 is about 30164.5318379053. The cubic root of 909898981 is about 969.0162488937.

The spelling of 909898981 in words is "nine hundred nine million, eight hundred ninety-eight thousand, nine hundred eighty-one".