101240309 has 2 divisors, whose sum is σ = 101240310. Its totient is φ = 101240308.

The previous prime is 101240299. The next prime is 101240323. The reversal of 101240309 is 903042101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78411025 + 22829284 = 8855^2 + 4778^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101240309 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 (101240339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50620154 + 50620155.

It is an arithmetic number, because the mean of its divisors is an integer number (50620155).

Almost surely, 2^101240309 is an apocalyptic number.

It is an amenable number.

101240309 is a deficient number, since it is larger than the sum of its proper divisors (1).

101240309 is an equidigital number, since it uses as much as digits as its factorization.

101240309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 101240309 is about 10061.8243375642. The cubic root of 101240309 is about 466.0700052012.

The spelling of 101240309 in words is "one hundred one million, two hundred forty thousand, three hundred nine".