1013194121 has 4 divisors (see below), whose sum is σ = 1013269572. Its totient is φ = 1013118672.

The previous prime is 1013194109. The next prime is 1013194129. The reversal of 1013194121 is 1214913101.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1214913101 = 89 ⋅13650709.

It can be written as a sum of positive squares in 2 ways, for example, as 103327225 + 909866896 = 10165^2 + 30164^2 .

It is a cyclic number.

It is not a de Polignac number, because 1013194121 - 2¹⁸ = 1012931977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1013194129) 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, 11510 + ... + 46463.

It is an arithmetic number, because the mean of its divisors is an integer number (253317393).

Almost surely, 2^1013194121 is an apocalyptic number.

It is an amenable number.

1013194121 is a deficient number, since it is larger than the sum of its proper divisors (75451).

1013194121 is an equidigital number, since it uses as much as digits as its factorization.

1013194121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75450.

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 1013194121 is about 31830.7103439430. The cubic root of 1013194121 is about 1004.3788381231.

The spelling of 1013194121 in words is "one billion, thirteen million, one hundred ninety-four thousand, one hundred twenty-one".