369216509 has 4 divisors (see below), whose sum is σ = 372872220. Its totient is φ = 365560800.

The previous prime is 369216503. The next prime is 369216511. The reversal of 369216509 is 905612963.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 284023609 + 85192900 = 16853^2 + 9230^2 .

It is a cyclic number.

It is not a de Polignac number, because 369216509 - 2¹² = 369212413 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (369216503) 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, 1827704 + ... + 1827905.

It is an arithmetic number, because the mean of its divisors is an integer number (93218055).

Almost surely, 2^369216509 is an apocalyptic number.

It is an amenable number.

369216509 is a deficient number, since it is larger than the sum of its proper divisors (3655711).

369216509 is a wasteful number, since it uses less digits than its factorization.

369216509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3655710.

The product of its (nonzero) digits is 87480, while the sum is 41.

The square root of 369216509 is about 19215.0073900584. The cubic root of 369216509 is about 717.3983451753.

The spelling of 369216509 in words is "three hundred sixty-nine million, two hundred sixteen thousand, five hundred nine".