1013721019 has 2 divisors, whose sum is σ = 1013721020. Its totient is φ = 1013721018.

The previous prime is 1013721017. The next prime is 1013721029. The reversal of 1013721019 is 9101273101.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1013721019 - 2¹ = 1013721017 is a prime.

It is a super-2 number, since 2×1013721019² = 2055260608724796722, which contains 22 as substring.

Together with 1013721017, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1013720984 and 1013721002.

It is not a weakly prime, because it can be changed into another prime (1013721011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506860509 + 506860510.

It is an arithmetic number, because the mean of its divisors is an integer number (506860510).

Almost surely, 2^1013721019 is an apocalyptic number.

1013721019 is a deficient number, since it is larger than the sum of its proper divisors (1).

1013721019 is an equidigital number, since it uses as much as digits as its factorization.

1013721019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 378, while the sum is 25.

The square root of 1013721019 is about 31838.9858349791. The cubic root of 1013721019 is about 1004.5529125284.

The spelling of 1013721019 in words is "one billion, thirteen million, seven hundred twenty-one thousand, nineteen".