1079779921 has 6 divisors (see below), whose sum is σ = 1186865666. Its totient is φ = 981618000.

The previous prime is 1079779891. The next prime is 1079779931. The reversal of 1079779921 is 1299779701.

It can be written as a sum of positive squares in only one way, i.e., 898500625 + 181279296 = 29975^2 + 13464^2 .

It is not a de Polignac number, because 1079779921 - 2⁷ = 1079779793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1079779931) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4461780 + ... + 4462021.

Almost surely, 2^1079779921 is an apocalyptic number.

1079779921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1079779921 is a deficient number, since it is larger than the sum of its proper divisors (107085745).

1079779921 is an equidigital number, since it uses as much as digits as its factorization.

1079779921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8923823 (or 8923812 counting only the distinct ones).

The product of its (nonzero) digits is 500094, while the sum is 52.

The square root of 1079779921 is about 32860.0048843575. The cubic root of 1079779921 is about 1025.9158725687.

The spelling of 1079779921 in words is "one billion, seventy-nine million, seven hundred seventy-nine thousand, nine hundred twenty-one".