1979249759 has 4 divisors (see below), whose sum is σ = 2021361504. Its totient is φ = 1937138016.

The previous prime is 1979249689. The next prime is 1979249771. The reversal of 1979249759 is 9579429791.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1979249759 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 (1979209759) 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, 21055802 + ... + 21055895.

It is an arithmetic number, because the mean of its divisors is an integer number (505340376).

Almost surely, 2^1979249759 is an apocalyptic number.

1979249759 is a deficient number, since it is larger than the sum of its proper divisors (42111745).

1979249759 is an equidigital number, since it uses as much as digits as its factorization.

1979249759 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42111744.

The product of its digits is 12859560, while the sum is 62.

The square root of 1979249759 is about 44488.7599175342. The cubic root of 1979249759 is about 1255.5486157676.

The spelling of 1979249759 in words is "one billion, nine hundred seventy-nine million, two hundred forty-nine thousand, seven hundred fifty-nine".