100426409 has 2 divisors, whose sum is σ = 100426410. Its totient is φ = 100426408.

The previous prime is 100426379. The next prime is 100426423. The reversal of 100426409 is 904624001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100000000 + 426409 = 10000^2 + 653^2 .

It is a cyclic number.

It is not a de Polignac number, because 100426409 - 2¹⁶ = 100360873 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (100426439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50213204 + 50213205.

It is an arithmetic number, because the mean of its divisors is an integer number (50213205).

Almost surely, 2^100426409 is an apocalyptic number.

It is an amenable number.

100426409 is a deficient number, since it is larger than the sum of its proper divisors (1).

100426409 is an equidigital number, since it uses as much as digits as its factorization.

100426409 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 26.

The square root of 100426409 is about 10021.2977702491. The cubic root of 100426409 is about 464.8176862661.

It can be divided in two parts, 100 and 426409, that multiplied together give a square (42640900 = 6530²).

The spelling of 100426409 in words is "one hundred million, four hundred twenty-six thousand, four hundred nine".