1013979665 has 4 divisors (see below), whose sum is σ = 1216775604. Its totient is φ = 811183728.

The previous prime is 1013979643. The next prime is 1013979667. The reversal of 1013979665 is 5669793101.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5669793101 = 7 ⋅809970443.

It can be written as a sum of positive squares in 2 ways, for example, as 173501584 + 840478081 = 13172^2 + 28991^2 .

It is a cyclic number.

It is not a de Polignac number, because 1013979665 - 2⁶ = 1013979601 is a prime.

It is a super-2 number, since 2×1013979665² = 2056309522067024450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1013979667) 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, 101397962 + ... + 101397971.

It is an arithmetic number, because the mean of its divisors is an integer number (304193901).

Almost surely, 2^1013979665 is an apocalyptic number.

It is an amenable number.

1013979665 is a deficient number, since it is larger than the sum of its proper divisors (202795939).

1013979665 is an equidigital number, since it uses as much as digits as its factorization.

1013979665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202795938.

The product of its (nonzero) digits is 306180, while the sum is 47.

The square root of 1013979665 is about 31843.0473573118. The cubic root of 1013979665 is about 1004.6383408640.

The spelling of 1013979665 in words is "one billion, thirteen million, nine hundred seventy-nine thousand, six hundred sixty-five".