103656409 has 2 divisors, whose sum is σ = 103656410. Its totient is φ = 103656408.

The previous prime is 103656407. The next prime is 103656439. The reversal of 103656409 is 904656301.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74442384 + 29214025 = 8628^2 + 5405^2 .

It is a cyclic number.

It is not a de Polignac number, because 103656409 - 2¹ = 103656407 is a prime.

It is a super-2 number, since 2×103656409² = 21489302253550562, which contains 22 as substring.

Together with 103656407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (103656403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51828204 + 51828205.

It is an arithmetic number, because the mean of its divisors is an integer number (51828205).

Almost surely, 2^103656409 is an apocalyptic number.

It is an amenable number.

103656409 is a deficient number, since it is larger than the sum of its proper divisors (1).

103656409 is an equidigital number, since it uses as much as digits as its factorization.

103656409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 103656409 is about 10181.1791556774. The cubic root of 103656409 is about 469.7484832025.

The spelling of 103656409 in words is "one hundred three million, six hundred fifty-six thousand, four hundred nine".