100302031981 has 2 divisors, whose sum is σ = 100302031982. Its totient is φ = 100302031980.

The previous prime is 100302031969. The next prime is 100302032003. The reversal of 100302031981 is 189130203001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52015924900 + 48286107081 = 228070^2 + 219741^2 .

It is an emirp because it is prime and its reverse (189130203001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 100302031981 - 2⁷ = 100302031853 is a prime.

It is a super-2 number, since 2×100302031981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100302031931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50151015990 + 50151015991.

It is an arithmetic number, because the mean of its divisors is an integer number (50151015991).

Almost surely, 2^100302031981 is an apocalyptic number.

It is an amenable number.

100302031981 is a deficient number, since it is larger than the sum of its proper divisors (1).

100302031981 is an equidigital number, since it uses as much as digits as its factorization.

100302031981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 28.

Adding to 100302031981 its reverse (189130203001), we get a palindrome (289432234982).

The spelling of 100302031981 in words is "one hundred billion, three hundred two million, thirty-one thousand, nine hundred eighty-one".