1979181697 has 4 divisors (see below), whose sum is σ = 1991324080. Its totient is φ = 1967039316.

The previous prime is 1979181679. The next prime is 1979181709. The reversal of 1979181697 is 7961819791.

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, and also an emirpimes, since its reverse is a distinct semiprime: 7961819791 = 79 ⋅100782529.

It is a cyclic number.

It is not a de Polignac number, because 1979181697 - 2¹¹ = 1979179649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1979188697) 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, 6070947 + ... + 6071272.

It is an arithmetic number, because the mean of its divisors is an integer number (497831020).

Almost surely, 2^1979181697 is an apocalyptic number.

It is an amenable number.

1979181697 is a deficient number, since it is larger than the sum of its proper divisors (12142383).

1979181697 is a wasteful number, since it uses less digits than its factorization.

1979181697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12142382.

The product of its digits is 1714608, while the sum is 58.

The square root of 1979181697 is about 44487.9949761731. The cubic root of 1979181697 is about 1255.5342237605.

The spelling of 1979181697 in words is "one billion, nine hundred seventy-nine million, one hundred eighty-one thousand, six hundred ninety-seven".