101020981 has 2 divisors, whose sum is σ = 101020982. Its totient is φ = 101020980.

The previous prime is 101020951. The next prime is 101021003. The reversal of 101020981 is 189020101.

It is an a-pointer prime, because the next prime (101021003) can be obtained adding 101020981 to its sum of digits (22).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95062500 + 5958481 = 9750^2 + 2441^2 .

It is a cyclic number.

It is not a de Polignac number, because 101020981 - 2¹⁷ = 100889909 is a prime.

It is a super-2 number, since 2×101020981² = 20410477204404722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101020951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50510490 + 50510491.

It is an arithmetic number, because the mean of its divisors is an integer number (50510491).

Almost surely, 2^101020981 is an apocalyptic number.

It is an amenable number.

101020981 is a deficient number, since it is larger than the sum of its proper divisors (1).

101020981 is an equidigital number, since it uses as much as digits as its factorization.

101020981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 101020981 is about 10050.9194106808. The cubic root of 101020981 is about 465.7331956489.

The spelling of 101020981 in words is "one hundred one million, twenty thousand, nine hundred eighty-one".