1214215309 has 4 divisors (see below), whose sum is σ = 1234120540. Its totient is φ = 1194310080.

The previous prime is 1214215307. The next prime is 1214215363. The reversal of 1214215309 is 9035124121.

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 273075625 + 941139684 = 16525^2 + 30678^2 .

It is a cyclic number.

It is not a de Polignac number, because 1214215309 - 2¹ = 1214215307 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1214215307) 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, 9952524 + ... + 9952645.

It is an arithmetic number, because the mean of its divisors is an integer number (308530135).

Almost surely, 2^1214215309 is an apocalyptic number.

It is an amenable number.

1214215309 is a deficient number, since it is larger than the sum of its proper divisors (19905231).

1214215309 is an equidigital number, since it uses as much as digits as its factorization.

1214215309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19905230.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 1214215309 is about 34845.5923898561. The cubic root of 1214215309 is about 1066.8382248255.

The spelling of 1214215309 in words is "one billion, two hundred fourteen million, two hundred fifteen thousand, three hundred nine".