100898981 has 2 divisors, whose sum is σ = 100898982. Its totient is φ = 100898980.

The previous prime is 100898957. The next prime is 100898983. The reversal of 100898981 is 189898001.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67732900 + 33166081 = 8230^2 + 5759^2 .

It is a cyclic number.

It is not a de Polignac number, because 100898981 - 2¹⁰ = 100897957 is a prime.

It is a super-2 number, since 2×100898981² = 20361208733676722, which contains 22 as substring.

Together with 100898983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100898983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50449490 + 50449491.

It is an arithmetic number, because the mean of its divisors is an integer number (50449491).

Almost surely, 2^100898981 is an apocalyptic number.

It is an amenable number.

100898981 is a deficient number, since it is larger than the sum of its proper divisors (1).

100898981 is an equidigital number, since it uses as much as digits as its factorization.

100898981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 44.

The square root of 100898981 is about 10044.8484806890. The cubic root of 100898981 is about 465.5456361350.

The spelling of 100898981 in words is "one hundred million, eight hundred ninety-eight thousand, nine hundred eighty-one".