100320509 has 2 divisors, whose sum is σ = 100320510. Its totient is φ = 100320508.

The previous prime is 100320499. The next prime is 100320527. The reversal of 100320509 is 905023001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100200100 + 120409 = 10010^2 + 347^2 .

It is a cyclic number.

It is not a de Polignac number, because 100320509 - 2¹² = 100316413 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100320529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50160254 + 50160255.

It is an arithmetic number, because the mean of its divisors is an integer number (50160255).

Almost surely, 2^100320509 is an apocalyptic number.

It is an amenable number.

100320509 is a deficient number, since it is larger than the sum of its proper divisors (1).

100320509 is an equidigital number, since it uses as much as digits as its factorization.

100320509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 100320509 is about 10016.0126297844. The cubic root of 100320509 is about 464.6542448434.

It can be divided in two parts, 1003 and 20509, that added together give a palindrome (21512).

The spelling of 100320509 in words is "one hundred million, three hundred twenty thousand, five hundred nine".