1978614249 has 4 divisors (see below), whose sum is σ = 2638152336. Its totient is φ = 1319076164.

The previous prime is 1978614247. The next prime is 1978614251. The reversal of 1978614249 is 9424168791.

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.

It is an interprime number because it is at equal distance from previous prime (1978614247) and next prime (1978614251).

It is a cyclic number.

It is not a de Polignac number, because 1978614249 - 2¹ = 1978614247 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1978614247) 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 3 ways as a sum of consecutive naturals, for example, 329769039 + ... + 329769044.

It is an arithmetic number, because the mean of its divisors is an integer number (659538084).

Almost surely, 2^1978614249 is an apocalyptic number.

It is an amenable number.

1978614249 is a deficient number, since it is larger than the sum of its proper divisors (659538087).

1978614249 is an equidigital number, since it uses as much as digits as its factorization.

1978614249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659538086.

The product of its digits is 870912, while the sum is 51.

The square root of 1978614249 is about 44481.6169782529. The cubic root of 1978614249 is about 1255.4142215588.

The spelling of 1978614249 in words is "one billion, nine hundred seventy-eight million, six hundred fourteen thousand, two hundred forty-nine".