1979997529 has 4 divisors (see below), whose sum is σ = 2022125184. Its totient is φ = 1937869876.

The previous prime is 1979997499. The next prime is 1979997557. The reversal of 1979997529 is 9257999791.

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 a cyclic number.

It is not a de Polignac number, because 1979997529 - 2⁷ = 1979997401 is a prime.

It is a super-3 number, since 3×1979997529³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1979997589) 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, 21063757 + ... + 21063850.

It is an arithmetic number, because the mean of its divisors is an integer number (505531296).

Almost surely, 2^1979997529 is an apocalyptic number.

It is an amenable number.

1979997529 is a deficient number, since it is larger than the sum of its proper divisors (42127655).

1979997529 is an equidigital number, since it uses as much as digits as its factorization.

1979997529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42127654.

The product of its digits is 28934010, while the sum is 67.

The square root of 1979997529 is about 44497.1631567676. The cubic root of 1979997529 is about 1255.7067132779.

The spelling of 1979997529 in words is "one billion, nine hundred seventy-nine million, nine hundred ninety-seven thousand, five hundred twenty-nine".