100918381 has 2 divisors, whose sum is σ = 100918382. Its totient is φ = 100918380.

The previous prime is 100918373. The next prime is 100918397. The reversal of 100918381 is 183819001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100701225 + 217156 = 10035^2 + 466^2 .

It is an emirp because it is prime and its reverse (183819001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 100918381 - 2³ = 100918373 is a prime.

It is a super-2 number, since 2×100918381² = 20369039247322322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100916381) 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, 50459190 + 50459191.

It is an arithmetic number, because the mean of its divisors is an integer number (50459191).

Almost surely, 2^100918381 is an apocalyptic number.

It is an amenable number.

100918381 is a deficient number, since it is larger than the sum of its proper divisors (1).

100918381 is an equidigital number, since it uses as much as digits as its factorization.

100918381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 31.

The square root of 100918381 is about 10045.8141033965. The cubic root of 100918381 is about 465.5754712779.

The spelling of 100918381 in words is "one hundred million, nine hundred eighteen thousand, three hundred eighty-one".