1949771679 has 4 divisors (see below), whose sum is σ = 2599695576. Its totient is φ = 1299847784.

The previous prime is 1949771657. The next prime is 1949771693. The reversal of 1949771679 is 9761779491.

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

It is a cyclic number.

It is not a de Polignac number, because 1949771679 - 2⁸ = 1949771423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1949771179) 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, 324961944 + ... + 324961949.

It is an arithmetic number, because the mean of its divisors is an integer number (649923894).

Almost surely, 2^1949771679 is an apocalyptic number.

1949771679 is a deficient number, since it is larger than the sum of its proper divisors (649923897).

1949771679 is an equidigital number, since it uses as much as digits as its factorization.

1949771679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649923896.

The product of its digits is 6001128, while the sum is 60.

The square root of 1949771679 is about 44156.2190297131. The cubic root of 1949771679 is about 1249.2842150531.

The spelling of 1949771679 in words is "one billion, nine hundred forty-nine million, seven hundred seventy-one thousand, six hundred seventy-nine".