1813401010649 has 2 divisors, whose sum is σ = 1813401010650. Its totient is φ = 1813401010648.

The previous prime is 1813401010579. The next prime is 1813401010703. The reversal of 1813401010649 is 9460101043181.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1811899060624 + 1501950025 = 1346068^2 + 38755^2 .

It is a cyclic number.

It is not a de Polignac number, because 1813401010649 - 2⁴⁰ = 713889382873 is a prime.

It is a super-2 number, since 2×1813401010649² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1813401010249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906700505324 + 906700505325.

It is an arithmetic number, because the mean of its divisors is an integer number (906700505325).

Almost surely, 2^{1813401010649} is an apocalyptic number.

It is an amenable number.

1813401010649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1813401010649 is an equidigital number, since it uses as much as digits as its factorization.

1813401010649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 38.

The spelling of 1813401010649 in words is "one trillion, eight hundred thirteen billion, four hundred one million, ten thousand, six hundred forty-nine".