100511381 has 2 divisors, whose sum is σ = 100511382. Its totient is φ = 100511380.

The previous prime is 100511329. The next prime is 100511399. The reversal of 100511381 is 183115001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 92948881 + 7562500 = 9641^2 + 2750^2 .

It is a cyclic number.

It is not a de Polignac number, because 100511381 - 2²⁶ = 33402517 is a prime.

It is a super-2 number, since 2×100511381² = 20205075421054322, 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 (100511321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50255690 + 50255691.

It is an arithmetic number, because the mean of its divisors is an integer number (50255691).

Almost surely, 2^100511381 is an apocalyptic number.

It is an amenable number.

100511381 is a deficient number, since it is larger than the sum of its proper divisors (1).

100511381 is an equidigital number, since it uses as much as digits as its factorization.

100511381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120, while the sum is 20.

The square root of 100511381 is about 10025.5364445001. The cubic root of 100511381 is about 464.9487452660.

Adding to 100511381 its reverse (183115001), we get a palindrome (283626382).

The spelling of 100511381 in words is "one hundred million, five hundred eleven thousand, three hundred eighty-one".