100870409 has 2 divisors, whose sum is σ = 100870410. Its totient is φ = 100870408.

The previous prime is 100870403. The next prime is 100870421. The reversal of 100870409 is 904078001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65205625 + 35664784 = 8075^2 + 5972^2 .

It is a cyclic number.

It is not a de Polignac number, because 100870409 - 2¹² = 100866313 is a prime.

It is not a weakly prime, because it can be changed into another prime (100870403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50435204 + 50435205.

It is an arithmetic number, because the mean of its divisors is an integer number (50435205).

Almost surely, 2^100870409 is an apocalyptic number.

It is an amenable number.

100870409 is a deficient number, since it is larger than the sum of its proper divisors (1).

100870409 is an equidigital number, since it uses as much as digits as its factorization.

100870409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 100870409 is about 10043.4261584382. The cubic root of 100870409 is about 465.5016884639.

It can be divided in two parts, 1008 and 70409, that added together give a palindrome (71417).

The spelling of 100870409 in words is "one hundred million, eight hundred seventy thousand, four hundred nine".