101203409 has 2 divisors, whose sum is σ = 101203410. Its totient is φ = 101203408.

The previous prime is 101203393. The next prime is 101203411. The reversal of 101203409 is 904302101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100000000 + 1203409 = 10000^2 + 1097^2 .

It is a cyclic number.

It is not a de Polignac number, because 101203409 - 2⁴ = 101203393 is a prime.

It is a Sophie Germain prime.

Together with 101203411, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (101203429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50601704 + 50601705.

It is an arithmetic number, because the mean of its divisors is an integer number (50601705).

Almost surely, 2^101203409 is an apocalyptic number.

It is an amenable number.

101203409 is a deficient number, since it is larger than the sum of its proper divisors (1).

101203409 is an equidigital number, since it uses as much as digits as its factorization.

101203409 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 101203409 is about 10059.9905069538. The cubic root of 101203409 is about 466.0133740260.

The spelling of 101203409 in words is "one hundred one million, two hundred three thousand, four hundred nine".