100307981 has 2 divisors, whose sum is σ = 100307982. Its totient is φ = 100307980.

The previous prime is 100307969. The next prime is 100307989. The reversal of 100307981 is 189703001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 92833225 + 7474756 = 9635^2 + 2734^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100307981 is a prime.

It is a super-2 number, since 2×100307981² = 20123382104592722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100307989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50153990 + 50153991.

It is an arithmetic number, because the mean of its divisors is an integer number (50153991).

Almost surely, 2^100307981 is an apocalyptic number.

It is an amenable number.

100307981 is a deficient number, since it is larger than the sum of its proper divisors (1).

100307981 is an equidigital number, since it uses as much as digits as its factorization.

100307981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 100307981 is about 10015.3872116858. The cubic root of 100307981 is about 464.6349020697.

The spelling of 100307981 in words is "one hundred million, three hundred seven thousand, nine hundred eighty-one".