1013566121 has 4 divisors (see below), whose sum is σ = 1014072144. Its totient is φ = 1013060100.

The previous prime is 1013566097. The next prime is 1013566181. The reversal of 1013566121 is 1216653101.

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: 1216653101 = 59 ⋅20621239.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1013566121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1013566181) 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, 249995 + ... + 254016.

It is an arithmetic number, because the mean of its divisors is an integer number (253518036).

Almost surely, 2^1013566121 is an apocalyptic number.

It is an amenable number.

1013566121 is a deficient number, since it is larger than the sum of its proper divisors (506023).

1013566121 is an equidigital number, since it uses as much as digits as its factorization.

1013566121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506022.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 1013566121 is about 31836.5532211011. The cubic root of 1013566121 is about 1004.5017442220.

The spelling of 1013566121 in words is "one billion, thirteen million, five hundred sixty-six thousand, one hundred twenty-one".