1815361841 has 2 divisors, whose sum is σ = 1815361842. Its totient is φ = 1815361840.

The previous prime is 1815361819. The next prime is 1815361909. The reversal of 1815361841 is 1481635181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1114224400 + 701137441 = 33380^2 + 26479^2 .

It is a cyclic number.

It is not a de Polignac number, because 1815361841 - 2¹⁰ = 1815360817 is a prime.

It is a super-2 number, since 2×1815361841² = 6591077227517818562, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1815361795 and 1815361804.

It is not a weakly prime, because it can be changed into another prime (1815361811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 907680920 + 907680921.

It is an arithmetic number, because the mean of its divisors is an integer number (907680921).

Almost surely, 2^1815361841 is an apocalyptic number.

It is an amenable number.

1815361841 is a deficient number, since it is larger than the sum of its proper divisors (1).

1815361841 is an equidigital number, since it uses as much as digits as its factorization.

1815361841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23040, while the sum is 38.

The square root of 1815361841 is about 42607.0632759405. The cubic root of 1815361841 is about 1219.8911129640.

The spelling of 1815361841 in words is "one billion, eight hundred fifteen million, three hundred sixty-one thousand, eight hundred forty-one".