1223356509 has 6 divisors (see below), whose sum is σ = 1767070526. Its totient is φ = 815571000.

The previous prime is 1223356507. The next prime is 1223356513. The reversal of 1223356509 is 9056533221.

1223356509 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 933608025 + 289748484 = 30555^2 + 17022^2 .

It is not a de Polignac number, because 1223356509 - 2¹ = 1223356507 is a prime.

It is a super-2 number, since 2×1223356509² = 2993202296225334162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223356507) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67964242 + ... + 67964259.

Almost surely, 2^1223356509 is an apocalyptic number.

It is an amenable number.

1223356509 is a deficient number, since it is larger than the sum of its proper divisors (543714017).

1223356509 is a wasteful number, since it uses less digits than its factorization.

1223356509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135928507 (or 135928504 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 36.

The square root of 1223356509 is about 34976.5136770376. The cubic root of 1223356509 is about 1069.5087589858.

The spelling of 1223356509 in words is "one billion, two hundred twenty-three million, three hundred fifty-six thousand, five hundred nine".