1356826209 has 4 divisors (see below), whose sum is σ = 1809101616. Its totient is φ = 904550804.

The previous prime is 1356826199. The next prime is 1356826267. The reversal of 1356826209 is 9026286531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9026286531 = 3 ⋅3008762177.

It is a cyclic number.

It is not a de Polignac number, because 1356826209 - 2⁴ = 1356826193 is a prime.

It is a super-2 number, since 2×1356826209² = 3681954722858623362, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1356826279) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 226137699 + ... + 226137704.

It is an arithmetic number, because the mean of its divisors is an integer number (452275404).

Almost surely, 2^1356826209 is an apocalyptic number.

It is an amenable number.

1356826209 is a deficient number, since it is larger than the sum of its proper divisors (452275407).

1356826209 is an equidigital number, since it uses as much as digits as its factorization.

1356826209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452275406.

The product of its (nonzero) digits is 155520, while the sum is 42.

The square root of 1356826209 is about 36835.1219490312. The cubic root of 1356826209 is about 1107.0691311588.

The spelling of 1356826209 in words is "one billion, three hundred fifty-six million, eight hundred twenty-six thousand, two hundred nine".