2212978509 has 16 divisors (see below), whose sum is σ = 3746842240. Its totient is φ = 1264559040.

The previous prime is 2212978489. The next prime is 2212978529. The reversal of 2212978509 is 9058792122.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2212978489) and next prime (2212978529).

It is not a de Polignac number, because 2212978509 - 2⁵ = 2212978477 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 (2212978529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5854252 + ... + 5854629.

It is an arithmetic number, because the mean of its divisors is an integer number (234177640).

Almost surely, 2^2212978509 is an apocalyptic number.

It is an amenable number.

2212978509 is a deficient number, since it is larger than the sum of its proper divisors (1533863731).

2212978509 is a wasteful number, since it uses less digits than its factorization.

2212978509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11708897 (or 11708891 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The square root of 2212978509 is about 47042.3055238580. The cubic root of 2212978509 is about 1303.1439700566.

The spelling of 2212978509 in words is "two billion, two hundred twelve million, nine hundred seventy-eight thousand, five hundred nine".