1921134579 has 16 divisors (see below), whose sum is σ = 3152631552. Its totient is φ = 1013345568.

The previous prime is 1921134529. The next prime is 1921134601. The reversal of 1921134579 is 9754311291.

It is not a de Polignac number, because 1921134579 - 2⁸ = 1921134323 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1921134579.

It is not an unprimeable number, because it can be changed into a prime (1921134529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3518289 + ... + 3518834.

It is an arithmetic number, because the mean of its divisors is an integer number (197039472).

Almost surely, 2^1921134579 is an apocalyptic number.

1921134579 is a deficient number, since it is larger than the sum of its proper divisors (1231496973).

1921134579 is a wasteful number, since it uses less digits than its factorization.

1921134579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7037146.

The product of its digits is 68040, while the sum is 42.

The square root of 1921134579 is about 43830.7492406872. The cubic root of 1921134579 is about 1243.1377736704.

It can be divided in two parts, 192 and 1134579, that added together give a triangular number (1134771 = T₁₅₀₆).

The spelling of 1921134579 in words is "one billion, nine hundred twenty-one million, one hundred thirty-four thousand, five hundred seventy-nine".