100391061 has 4 divisors (see below), whose sum is σ = 133854752. Its totient is φ = 66927372.

The previous prime is 100391033. The next prime is 100391099. The reversal of 100391061 is 160193001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 160193001 = 3 ⋅53397667.

It is not a de Polignac number, because 100391061 - 2⁵ = 100391029 is a prime.

It is a super-3 number, since 3×100391061³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100391261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16731841 + ... + 16731846.

It is an arithmetic number, because the mean of its divisors is an integer number (33463688).

Almost surely, 2^100391061 is an apocalyptic number.

It is an amenable number.

100391061 is a deficient number, since it is larger than the sum of its proper divisors (33463691).

100391061 is an equidigital number, since it uses as much as digits as its factorization.

100391061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33463690.

The product of its (nonzero) digits is 162, while the sum is 21.

The square root of 100391061 is about 10019.5339711985. The cubic root of 100391061 is about 464.7631444915.

The spelling of 100391061 in words is "one hundred million, three hundred ninety-one thousand, sixty-one".